[][dts: mt7981: Fix web upgrade failure]

[Description]
Change supported-device names to align with compatible string in dts.
Web upgrading will check if the two strings match.

[Release-log]
N/A

Change-Id: I4680e0a945429c5d9e7e807a06a480dbe240b383
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5702933
diff --git a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-spim-nand-2500wan-gmac2.dts b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-spim-nand-2500wan-gmac2.dts
index 904d529..6c24709 100644
--- a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-spim-nand-2500wan-gmac2.dts
+++ b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-spim-nand-2500wan-gmac2.dts
@@ -2,7 +2,7 @@
 #include "mt7981.dtsi"
 / {
 	model = "MediaTek MT7981 RFB";
-	compatible = "mediatek,mt7981-spim-snand-rfb";
+	compatible = "mediatek,mt7981-spim-snand-2500wan-gmac2-rfb";
 	chosen {
 		bootargs = "console=ttyS0,115200n1 loglevel=8  \
 				earlycon=uart8250,mmio32,0x11002000";