archs38: use kernel 6.6 by default

Switch to Linux kernel version 6.6.

Signed-off-by: Mieczyslaw Nalewaj <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16021
Signed-off-by: Robert Marko <[email protected]>

target/linux/archs38/Makefile

@@ -11,8 +11,7 @@ BOARDNAME:=Synopsys DesignWare ARC HS38
 FEATURES:=source-only
 SUBTARGETS:=generic
 
-KERNEL_PATCHVER:=6.1
-KERNEL_TESTING_PATCHVER:=6.6
+KERNEL_PATCHVER:=6.6
 
 DEVICE_TYPE:=basic