add support for more devices on Meson8 and Meson8b

This series adds:
- USB support on Meson8 and Meson8b (it seems that some boards show an ? error when trying to initialize one of the USB2 PHYs, but we have the ? same problem on some GXBB boards. it is working fine for me - on a board ? which is not supported upstream yet)
- hardware random number generator support (Meson8 and Meson8b seem to ? have two 32-bit hardware random number generator registers, while the ? GX SoCs only have one. This is not handled by the meson-rng driver yet, ? but that can still be improved later on)
- SAR ADC support
- add reserved memory zones to fix random hangs when filling the memory ? (currently only on Meson8 until I have a Meson8b device to test if the ? same problem appears there as well)
- use the real ethernet clock on Meson8 and Meson8b to fix ethernet when ? the bootloader does not enable the gate clock
- add the SCU (Snoop Control Unit) which is needed for SMP support
- minor preparations for further .dts updates as this already exports the ? SDIO clocks (a driver for this MMC controller is work-in-progress) as ? well as the corresponding pin definitions in meson8.dtsi
- this adds the pwm_e (typically used for the 32.768 kHz LPO clock for the ? SDIO wifi chip) and pwm_f (used on some boards for the dimmable power ? LED) pins to meson8.dtsi

NOTE: the .dts changes from this series depend on my previous patch from [0]: "ARM: dts: meson8: fix the IR receiver pins"

[0] http://lists.infradead.org/pipermail/linux-amlogic/2017-June/003983.html

Martin Blumenstingl (13):
? clk: meson8b: export the SAR ADC clocks
? clk: meson8b: export the SDIO clock
? clk: meson8b: export the gate clock for the HW random number generator ? clk: meson8b: export the USB clocks
? clk: meson8b: export the ethernet gate clock

? ARM: dts: meson8: add the PWM_E and PWM_F pins
? ARM: dts: meson8: add the pins for the SDIO controller ? ARM: dts: meson: add the SAR ADC
? ARM: dts: meson8: add reserved memory zones
? ARM: dts: meson: add the hardware random number generator ? ARM: dts: meson: add USB support on Meson8 and Meson8b ? ARM: dts: meson8b: add the SCU device node
? ARM: dts: meson: use the real ethernet clock on Meson8 and Meson8b

?arch/arm/boot/dts/meson.dtsi?????????????|??51 +++++++++++++++ ?arch/arm/boot/dts/meson8.dtsi????????????| 109
++++++++++++++++++++++++++++++-

?arch/arm/boot/dts/meson8b.dtsi???????????|??49 ++++++++++++++
?drivers/clk/meson/meson8b.h??????????????|??20 +++---
?include/dt-bindings/clock/meson8b-clkc.h |??10 +++

?5 files changed, 228 insertions(+), 11 deletions(-)