[][Add initial mtk feed for OpenWRT v21.02]

[Description]
Add initial mtk feed for OpenWRT v21.02

[Release-log]
N/A

Change-Id: I8051c6ba87f1ccf26c02fdd88a17d66f63c0b101
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4495320
diff --git a/target/linux/mediatek/patches-5.4/401-pinctrl-add-mt7986-driver.patch b/target/linux/mediatek/patches-5.4/401-pinctrl-add-mt7986-driver.patch
new file mode 100644
index 0000000..a02873d
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/401-pinctrl-add-mt7986-driver.patch
@@ -0,0 +1,30 @@
+diff --git a/drivers/pinctrl/mediatek/Kconfig b/drivers/pinctrl/mediatek/Kconfig
+index 701f9af..9109f91 100644
+--- a/drivers/pinctrl/mediatek/Kconfig
++++ b/drivers/pinctrl/mediatek/Kconfig
+@@ -100,6 +100,13 @@ config PINCTRL_MT7622
+ 	default ARM64 && ARCH_MEDIATEK
+ 	select PINCTRL_MTK_MOORE
+ 
++config PINCTRL_MT7986
++	bool "Mediatek MT7986 pin control"
++	depends on OF
++	depends on ARM64 || COMPILE_TEST
++	default ARM64 && ARCH_MEDIATEK
++	select PINCTRL_MTK_MOORE
++
+ config PINCTRL_MT8173
+ 	bool "Mediatek MT8173 pin control"
+ 	depends on OF
+diff --git a/drivers/pinctrl/mediatek/Makefile b/drivers/pinctrl/mediatek/Makefile
+index a74325a..d408585 100644
+--- a/drivers/pinctrl/mediatek/Makefile
++++ b/drivers/pinctrl/mediatek/Makefile
+@@ -15,6 +15,7 @@ obj-$(CONFIG_PINCTRL_MT6797)	+= pinctrl-mt6797.o
+ obj-$(CONFIG_PINCTRL_MT7622)	+= pinctrl-mt7622.o
+ obj-$(CONFIG_PINCTRL_MT7623)	+= pinctrl-mt7623.o
+ obj-$(CONFIG_PINCTRL_MT7629)	+= pinctrl-mt7629.o
++obj-$(CONFIG_PINCTRL_MT7986)	+= pinctrl-mt7986.o
+ obj-$(CONFIG_PINCTRL_MT8173)	+= pinctrl-mt8173.o
+ obj-$(CONFIG_PINCTRL_MT8183)	+= pinctrl-mt8183.o
+ obj-$(CONFIG_PINCTRL_MT8516)	+= pinctrl-mt8516.o