pistachio: enable 6.18 testing kernel

The pistachio target now supports 6.18 kernel as testing.

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

Author: wigyori

target/linux/pistachio/Makefile

@@ -13,6 +13,7 @@ CPU_SUBTYPE:=24kf
 SUBTARGETS:=generic
 
 KERNEL_PATCHVER:=6.12
+KERNEL_TESTING_PATCHVER:=6.18
 
 include $(INCLUDE_DIR)/target.mk