[Refactor kernel sync flow from Openwrt]

[Description]
Refactor kernel sync flow from Openwrt
1.remove old patch

[Release-log]
N/A

diff --git a/mtk_scripts/filogic-sync-openwrt-linux.sh b/mtk_scripts/filogic-sync-openwrt-linux.sh
index 483762d..f801905 100755
--- a/mtk_scripts/filogic-sync-openwrt-linux.sh
+++ b/mtk_scripts/filogic-sync-openwrt-linux.sh
@@ -11,6 +11,8 @@
 		echo "rm $aa"
 		rm -rf ./$aa
 	done
+	#remove old legacy mt7622 patch
+	rm -rf ./target/linux/mediatek/patches-5.4/0303-mtd-spinand-disable-on-die-ECC.patch
 }
 cp -fpR mtk_openwrt_feeds/target ./openwrt
 cp mtk_openwrt_feeds/remove.patch.list openwrt/