mediatek: filogic: convert Xiaomi AX3000T to fitblk

Use fitblk driver instead of deprecated partition parser.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

target/linux/mediatek/dts/mt7981b-xiaomi-mi-router-ax3000t-ubootmod.dts

@@ -6,11 +6,23 @@
 / {
 	model = "Xiaomi Mi Router AX3000T (OpenWrt U-Boot layout)";
 	compatible = "xiaomi,mi-router-ax3000t-ubootmod", "mediatek,mt7981";
+
+	chosen {
+		bootargs-append = " root=/dev/fit0 rootwait";
+		rootdisk = <&ubi_rootdisk>;
+	};
 };
 
 &partitions {
 	partition@600000 {
 		label = "ubi";
 		reg = <0x600000 0x7000000>;
+				compatible = "linux,ubi";
+
+				volumes {
+					ubi_rootdisk: ubi-volume-fit {
+						volname = "fit";
+					};
+				};
 	};
 };