[][Add initial mt7981 target support in SDK]

[Description]
Add initial mt7981 target support in SDK

[Release-log]
N/A

Change-Id: Id7b3e04856c2a26e030a83dbfb57779b815b173f
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5058341
diff --git a/target/linux/mediatek/mt7986/config-5.4 b/target/linux/mediatek/mt7986/config-5.4
index 935d3e2..56c1b0a 100644
--- a/target/linux/mediatek/mt7986/config-5.4
+++ b/target/linux/mediatek/mt7986/config-5.4
@@ -387,6 +387,7 @@
 # CONFIG_PINCTRL_MT6765 is not set
 # CONFIG_PINCTRL_MT6797 is not set
 # CONFIG_PINCTRL_MT7622 is not set
+# CONFIG_PINCTRL_MT7981 is not set
 CONFIG_PINCTRL_MT7986=y
 # CONFIG_PINCTRL_MT8173 is not set
 # CONFIG_PINCTRL_MT8183 is not set