[][dts: mt7986: Add sd-card dts files and fix missing string]

[Description]
Add sd-card dts files and fix missing string

[Release-log]
N/A

Change-Id: Ic7502c325e1fd36b927dfaea7892912947628525
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5499539
diff --git a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986b-2500wan-spim-nand-rfb.dts b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986b-2500wan-spim-nand-rfb.dts
index 343ad2b..d2b3ba3 100644
--- a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986b-2500wan-spim-nand-rfb.dts
+++ b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986b-2500wan-spim-nand-rfb.dts
@@ -4,7 +4,7 @@
 #include "mt7986-spim-nand-partition.dtsi"
 / {
 	model = "MediaTek MT7986b RFB";
-	compatible = "mediatek,mt7986b-spim-snand-rfb";
+	compatible = "mediatek,mt7986b-2500wan-spim-snand-rfb";
 	chosen {
 		bootargs = "console=ttyS0,115200n1 loglevel=8  \
 				earlycon=uart8250,mmio32,0x11002000";