Fix the overlapping registers issue for the MediTek audio system

Hi,

This is the new round of the audsys. I add devm_of_platform_populate() in the clock driver to populate the child devices (AFE) so that we can handle the dependency for all functions.

changes since v4:
- remove "simple-mfd" from mediatek,audsys.txt.
- switch to use devm_of_platform_populate() to populate the child devices.

changes since v3:
- Rebase to v4.16.
- Modify clock driver for the sake of the backward compatibility.
- Rewrite commit message of patch 4/5 to make it more specific.

changes since v2:
- Drop useless changes in clk-mt7622-aud.c.
- Revise binding text:
- Add more information about audio subsystem.
- Separate clock node and AFE node.
- Update license header.

changes since v1:
- To avoid writing an MFD driver, we add "simple-mfd" in the audsys binding.
- Move three top clocks to audio driver [1] as we remove mfd/mtk-audsys.c in
v1.

Ryder Lee (6):
clk: mediatek: update missing clock data for MT7622 audsys
clk: mediatek: add devm_of_platform_populate() for MT7622 audsys
clk: mediatek: add audsys support for MT2701
dt-bindings: clock: mediatek: update audsys documentation to adapt MFD
device
dt-bindings: clock: mediatek: add audsys support for MT2701
arm: dts: mediatek: modify audio related nodes for both MT2701 and

    MT7623

 .../bindings/arm/mediatek/mediatek,audsys.txt      |  20 ++-
 arch/arm/boot/dts/mt2701.dtsi                      | 188 ++++++++++----------
 arch/arm/boot/dts/mt7623.dtsi                      | 190 ++++++++++-----------
 drivers/clk/mediatek/Kconfig                       |   6 +
 drivers/clk/mediatek/Makefile                      |   1 +
 drivers/clk/mediatek/clk-mt2701-aud.c              | 177 +++++++++++++++++++
 drivers/clk/mediatek/clk-mt7622-aud.c              |   9 +-
 include/dt-bindings/clock/mt7622-clk.h             |   3 +-
 8 files changed, 390 insertions(+), 204 deletions(-)
 create mode 100644 drivers/clk/mediatek/clk-mt2701-aud.c

1.9.1