mediatek: switch to Linux 6.12 by default

Use Linux kernel version 6.12 by default for all mediatek subtargets.

Signed-off-by: Daniel Golle <[email protected]>

target/linux/mediatek/Makefile

@@ -8,8 +8,7 @@ BOARDNAME:=MediaTek ARM
 SUBTARGETS:=filogic mt7622 mt7623 mt7629
 FEATURES:=dt-overlay emmc fpu gpio nand pci pcie rootfs-part separate_ramdisk squashfs usb
 
-KERNEL_PATCHVER:=6.6
-KERNEL_TESTING_PATCHVER:=6.12
+KERNEL_PATCHVER:=6.12
 
 include $(INCLUDE_DIR)/target.mk
 DEFAULT_PACKAGES += \