[][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/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-mt7975-ax6000-rfb1.dts b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-mt7975-ax6000-rfb1.dts
new file mode 100644
index 0000000..58d11b6
--- /dev/null
+++ b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-mt7975-ax6000-rfb1.dts
@@ -0,0 +1,12 @@
+/dts-v1/;
+#include "mt7986a-rfb.dtsi"
+/ {
+	model = "MediaTek MT7986a RFB";
+	compatible = "mediatek,mt7986a-rfb";
+
+	wsys_adie: wsys_adie@0 {
+		compatible = "mediatek,rebb-mt7986-adie";
+		adie_id = <7975>;
+		sku_type = <6000>;
+	};
+};