mxs: enable 6.18 testing kernel

The mxs target now supports 6.18 kernel as testing.

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>

Author: wigyori

target/linux/mxs/Makefile

@@ -12,6 +12,7 @@ CPU_TYPE:=arm926ej-s
 SUBTARGETS:=generic
 
 KERNEL_PATCHVER:=6.12
+KERNEL_TESTING_PATCHVER:=6.18
 
 KERNELNAME:=zImage dtbs