cns3xxx: switch to kernel 4.19

Signed-off-by: Koen Vandeputte <[email protected]>

target/linux/cns3xxx/Makefile

@@ -14,8 +14,7 @@ CPU_TYPE:=mpcore
 CPU_SUBTYPE:=vfp
 MAINTAINER:=Felix Fietkau <[email protected]>, \
 	    Koen Vandeputte <[email protected]>
-KERNEL_PATCHVER:=4.14
-KERNEL_TESTING_PATCHVER := 4.19
+KERNEL_PATCHVER:=4.19
 
 define Target/Description
 	Build images for Cavium Networks Econa CNS3xxx based boards,