mediatek: enable testing kernel 6.12

Set KERNEL_TESTING_PATCHVER to allow testing Linux 6.12.

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

target/linux/mediatek/Makefile

@@ -9,6 +9,7 @@ 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
 
 include $(INCLUDE_DIR)/target.mk
 DEFAULT_PACKAGES += \