[][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/openwrt_patches-21.02/105-enable-dm-verity-for-mt7622.patch b/openwrt_patches-21.02/105-enable-dm-verity-for-mt7622.patch
new file mode 100644
index 0000000..c4386ba
--- /dev/null
+++ b/openwrt_patches-21.02/105-enable-dm-verity-for-mt7622.patch
@@ -0,0 +1,38 @@
+diff --git a/target/linux/mediatek/mt7622/config-5.4 b/target/linux/mediatek/mt7622/config-5.4
+index edecba3..c95ad3f 100644
+--- a/target/linux/mediatek/mt7622/config-5.4
++++ b/target/linux/mediatek/mt7622/config-5.4
+@@ -114,6 +114,9 @@ CONFIG_ARM_PMU=y
+ CONFIG_ARM_PSCI_FW=y
+ CONFIG_ATA=y
+ CONFIG_AUDIT_ARCH_COMPAT_GENERIC=y
++CONFIG_BLK_DEV_DM=y
++CONFIG_BLK_DEV_DM_BUILTIN=y
++# CONFIG_BLK_DEV_MD is not set
+ CONFIG_BLK_DEV_SD=y
+ CONFIG_BLK_MQ_PCI=y
+ CONFIG_BLK_PM=y
+@@ -220,6 +223,15 @@ CONFIG_DMA_ENGINE_RAID=y
+ CONFIG_DMA_OF=y
+ CONFIG_DMA_REMAP=y
+ CONFIG_DMA_VIRTUAL_CHANNELS=y
++CONFIG_DM_BUFIO=y
++# CONFIG_DM_CRYPT is not set
++# CONFIG_DM_DEBUG_BLOCK_MANAGER_LOCKING is not set
++CONFIG_DM_INIT=y
++# CONFIG_DM_MIRROR is not set
++# CONFIG_DM_SNAPSHOT is not set
++CONFIG_DM_VERITY=y
++# CONFIG_DM_VERITY_FEC is not set
++# CONFIG_DM_VERITY_VERIFY_ROOTHASH_SIG is not set
+ CONFIG_DRM_RCAR_WRITEBACK=y
+ CONFIG_DTC=y
+ CONFIG_DYNAMIC_DEBUG=y
+@@ -378,6 +390,7 @@ CONFIG_LOCK_SPIN_ON_OWNER=y
+ CONFIG_LZO_COMPRESS=y
+ CONFIG_LZO_DECOMPRESS=y
+ CONFIG_MAGIC_SYSRQ=y
++CONFIG_MD=y
+ CONFIG_MDIO_BUS=y
+ CONFIG_MDIO_DEVICE=y
+ CONFIG_MEDIATEK_MT6577_AUXADC=y