[][Add clock and pinctrl setting and i2c pwm to mt7986 DT]

[Description]
Add more pinctrl pinmux list into DT
Modify DT according to releated clock driver
Add i2c and pwm in DT

Change since v1:
Add mt7986 compatiable string to i2c and pwm driver
Enable i2c in mt7986 kernel config
Fix pwm reg info in DT
Add memory node back to prevent hang when u-boot can't carry memery size info.

Change since v2:
fix pwm clock and it's  pinctrl node

Change since v3:
Add ethernet clock parent

Change since v4:
Fix ethernet clock parent

Change since v5:
Fix auxadc and ethernet (ethsys)

[Release-log]
Build Pass
Boot-up from spim-nand flash pass

Update since v1:
I2C test pass with i2cdetect command

Update since v2:
PWM test pass with blinking led

Update since V5:
Ethernet test pass with ping
auxadc test pass with cat sysfs

INFRACFG driver in pwm2_ck_sel, and pwm1_ck_sel have bug,
We got 32k instead of csw_pwm_ck, need clock owner to fix this.
--> Fix by change 4619106

Change-Id: Icac52cae356796fec6b9e3652747e14fed9cf4e0
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4610073
diff --git a/target/linux/mediatek/patches-5.4/0001-clk-mtk-add-mt7986-support.patch b/target/linux/mediatek/patches-5.4/0001-clk-mtk-add-mt7986-support.patch
index 324be72..930e88b 100644
--- a/target/linux/mediatek/patches-5.4/0001-clk-mtk-add-mt7986-support.patch
+++ b/target/linux/mediatek/patches-5.4/0001-clk-mtk-add-mt7986-support.patch
@@ -5,10 +5,10 @@
 @@ -258,6 +258,15 @@ config COMMON_CLK_MT7629_HIFSYS
  	  This driver supports MediaTek MT7629 HIFSYS clocks providing
  	  to PCI-E and USB.
- 
+
 +config COMMON_CLK_MT7986
 +	bool "Clock driver for MediaTek MT7986"
-+	depends on (ARCH_MEDIATEK && ARM) || COMPILE_TEST
++	depends on ARCH_MEDIATEK || COMPILE_TEST
 +	select COMMON_CLK_MEDIATEK
 +	default ARCH_MEDIATEK && ARM
 +	---help---