[][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-5.4/0930-pwm-add-mt7986-support.patch b/target/linux/mediatek/patches-5.4/0930-pwm-add-mt7986-support.patch
new file mode 100644
index 0000000..a791d3a
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/0930-pwm-add-mt7986-support.patch
@@ -0,0 +1,24 @@
+diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
+index b94e0d0..35a0db2 100644
+--- a/drivers/pwm/pwm-mediatek.c
++++ b/drivers/pwm/pwm-mediatek.c
+@@ -302,6 +302,11 @@ static const struct pwm_mediatek_of_data mt7629_pwm_data = {
+ 	.pwm45_fixup = false,
+ };
+
++static const struct pwm_mediatek_of_data mt7986_pwm_data = {
++	.num_pwms = 2,
++	.pwm45_fixup = false,
++};
++
+ static const struct pwm_mediatek_of_data mt8516_pwm_data = {
+ 	.num_pwms = 5,
+ 	.pwm45_fixup = false,
+@@ -313,6 +318,7 @@ static const struct of_device_id pwm_mediatek_of_match[] = {
+ 	{ .compatible = "mediatek,mt7623-pwm", .data = &mt7623_pwm_data },
+ 	{ .compatible = "mediatek,mt7628-pwm", .data = &mt7628_pwm_data },
+ 	{ .compatible = "mediatek,mt7629-pwm", .data = &mt7629_pwm_data },
++	{ .compatible = "mediatek,mt7986-pwm", .data = &mt7986_pwm_data },
+ 	{ .compatible = "mediatek,mt8516-pwm", .data = &mt8516_pwm_data },
+ 	{ },
+ };