Add MediaTek IEEE 802.11ax devices - MT7915E

@Felix, a bit changes and cleanups in v3. Hope this is final one if evevything looks good to you guys.

MT7915 supports only basic HE for the moment, whereas other 802.11ax specific features are work in progress. They will be gradually added in upcoming days.

The firmwares are available now from https://github.com/ryderlee1110/wireless-fw
At last, the developers are all listed in the series.

https://www.mediatek.com/blog/mediatek-mt7915-wi-fi-6-wave-1-chipset-builds-in-a-range-of-industry-firsts

Changes since v3 -
- rebase on top of latest mt76 tree.
- adjust timing stuff in mt7915_mac_set_timing.
- some cleanups - use FIELD_GET and max_t whenever possible.

Changes since v2 -
- drop hw_amsdu patch
- fix kconfig license
- fix debugfs regard to txpower dump issue
- swtich to use "per-phy" to set runtime stream caps for dual band concurrent operation.
- move omac_idx to mt7915_phy to make it independent
- add .get/set_tsf callbacks

Changes since v1 -
- list a missing developer.
- drop unused codes in the hw_tx_amsdu patch.
- add a missing bitwidth change of wcid.
- add more TODO items in the driver.

Ryder Lee (18):
mt76: avoid rx reorder buffer overflow
mt76: add support for HE RX rate reporting
mt76: add Rx stats support for radiotap
mt76: adjust wcid size to support new 802.11ax generation
mt76: add HE phy modes and hardware queue
mt76: add mac80211 driver for MT7915 PCIe-based chipsets
mt76: mt7915: enable Rx HE rate reporting
mt76: mt7915: implement HE per-rate tx power support
mt76: mt7915: register per-phy HE capabilities for each interface
mt76: mt7915: add HE bss_conf support for interfaces
mt76: mt7915: add HE capabilities support for peers
mt76: mt7915: add Rx radiotap header support
mt76: mt7915: add .sta_add_debugfs support
mt76: mt7915: add .sta_statistics support
mt76: mt7915: set peer Tx fixed rate through debugfs
mt76: mt7915: add tsf related callbacks
mt76: mt7915: enable firmware module debug support
mt76: set runtime stream caps by mt76_phy

 drivers/net/wireless/mediatek/mt76/Kconfig    |    1 +
 drivers/net/wireless/mediatek/mt76/Makefile   |    1 +
 drivers/net/wireless/mediatek/mt76/agg-rx.c   |   12 +-
 drivers/net/wireless/mediatek/mt76/mac80211.c |   26 +-
 drivers/net/wireless/mediatek/mt76/mt76.h     |   46 +-
 .../net/wireless/mediatek/mt76/mt7615/init.c  |    4 +-
 .../net/wireless/mediatek/mt76/mt7615/main.c  |    2 +-
 .../wireless/mediatek/mt76/mt76x2/pci_main.c  |    2 +-
 .../net/wireless/mediatek/mt76/mt7915/Kconfig |   13 +
 .../wireless/mediatek/mt76/mt7915/Makefile    |    6 +
 .../wireless/mediatek/mt76/mt7915/debugfs.c   |  418 +++
 .../net/wireless/mediatek/mt76/mt7915/dma.c   |  285 ++
 .../wireless/mediatek/mt76/mt7915/eeprom.c    |  243 ++
 .../wireless/mediatek/mt76/mt7915/eeprom.h    |  125 +
 .../net/wireless/mediatek/mt76/mt7915/init.c  |  589 ++++
 .../net/wireless/mediatek/mt76/mt7915/mac.c   | 1462 +++++++++
 .../net/wireless/mediatek/mt76/mt7915/mac.h   |  346 +++
 .../net/wireless/mediatek/mt76/mt7915/main.c  |  831 +++++
 .../net/wireless/mediatek/mt76/mt7915/mcu.c   | 2764 +++++++++++++++++
 .../net/wireless/mediatek/mt76/mt7915/mcu.h   |  982 ++++++
 .../wireless/mediatek/mt76/mt7915/mt7915.h    |  460 +++
 .../net/wireless/mediatek/mt76/mt7915/pci.c   |  191 ++
 .../net/wireless/mediatek/mt76/mt7915/regs.h  |  355 +++
 23 files changed, 9132 insertions(+), 32 deletions(-)
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/Kconfig
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/Makefile
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/dma.c
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/eeprom.h
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/init.c
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/mac.c
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/mac.h
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/main.c
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/mcu.h
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/pci.c
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7915/regs.h

2.18.0