kirkwood: add 6.6 kernel as testing version

This patch introduce kernel 6.6 for kirkwood target as testing version.

Signed-off-by: Pawel Dembicki <[email protected]>

target/linux/kirkwood/Makefile

@@ -12,6 +12,7 @@ CPU_TYPE:=xscale
 SUBTARGETS:=generic
 
 KERNEL_PATCHVER:=6.1
+KERNEL_TESTING_PATCHVER:=6.6
 
 include $(INCLUDE_DIR)/target.mk