realview: bump to v4.4

Signed-off-by: John Crispin <[email protected]>

target/linux/realview/Makefile

@@ -14,7 +14,7 @@ CPU_TYPE:=mpcore
 CPU_SUBTYPE:=vfp
 MAINTAINER:=Florian Fainelli <[email protected]>
 
-KERNEL_PATCHVER:=3.18
+KERNEL_PATCHVER:=4.4
 
 DEVICE_TYPE:=developerboard