lantiq: switch to kernel 6.1

Let's switch the lantiq target to use kernel 6.1 by default.

Signed-off-by: Martin Schiller <[email protected]>

target/linux/lantiq/Makefile

@@ -9,8 +9,7 @@ BOARDNAME:=Lantiq
 FEATURES:=squashfs
 SUBTARGETS:=xrx200 xway xway_legacy falcon ase
 
-KERNEL_PATCHVER:=5.15
-KERNEL_TESTING_PATCHVER:=6.1
+KERNEL_PATCHVER:=6.1
 
 define Target/Description
 	Build firmware images for Lantiq SoC