bmips: enable testing kernel version with 6.1 version

Enable testing kernel version with 6.1 kernel version.

Signed-off-by: Álvaro Fernández Rojas <[email protected]>

target/linux/bmips/Makefile

@@ -10,6 +10,7 @@ SUBTARGETS:=bcm6318 bcm6328 bcm6358 bcm6362 bcm6368 bcm63268
 FEATURES:=gpio squashfs usb
 
 KERNEL_PATCHVER:=5.15
+KERNEL_TESTING_PATCHVER:=6.1
 
 define Target/Description
 	Build firmware images for BCM33xx cable modem chips,