mediatek: re-enable mt7622-rfb1-ubi with changed partition layout

The boot loader does not have a fixed size limit for the kernel,
so we're free to change the layout. This may break sysupgrade, but a fresh
flash from initramfs works.

Fixes: 6e2962d4c548 ("mediatek: mt7622: skip build for MT7622 rfb1 (UBI)")
Signed-off-by: Felix Fietkau <[email protected]>

target/linux/mediatek/dts/mt7622-rfb1-ubi.dts

@@ -44,12 +44,12 @@
 
 			partition@200000 {
 				label = "kernel";
-				reg = <0x2c0000 0x400000>;
+				reg = <0x2c0000 0x600000>;
 			};
 
 			partition@6c0000 {
 				label = "ubi";
-				reg = <0x6c0000 0x6f00000>;
+				reg = <0x8c0000 0x6f00000>;
 			};
 
 			/delete-node/ partition@2200000;

target/linux/mediatek/image/mt7622.mk

@@ -295,14 +295,14 @@ define Device/mediatek_mt7622-rfb1-ubi
   UBINIZE_OPTS := -E 5
   BLOCKSIZE := 128k
   PAGESIZE := 2048
-  KERNEL_SIZE := 4194304
+  KERNEL_SIZE := 6291456
   IMAGE_SIZE := 32768k
   IMAGES += factory.bin
   IMAGE/factory.bin := append-kernel | pad-to $$(KERNEL_SIZE) | append-ubi | \
                 check-size $$$$(IMAGE_SIZE)
   IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
 endef
-# TARGET_DEVICES += mediatek_mt7622-rfb1-ubi
+TARGET_DEVICES += mediatek_mt7622-rfb1-ubi
 
 define Device/netgear_wax206
   $(Device/dsa-migration)