stm32: use kernel 6.12 by default

Switch to Linux kernel 6.12.

Signed-off-by: Thomas Richard <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20468
Signed-off-by: Nick Hainke <[email protected]>

target/linux/stm32/Makefile

@@ -11,8 +11,7 @@ FEATURES:=boot-part emmc ext4 gpio rtc usb
 SUBTARGETS:=stm32mp1
 CPU_TYPE:=
 
-KERNEL_PATCHVER:=6.6
-KERNEL_TESTING_PATCHVER:=6.12
+KERNEL_PATCHVER:=6.12
 
 include $(INCLUDE_DIR)/target.mk