omap: update to linux 3.18, it has been tested by at least one builder and 3.13 has not been built by buildbot in a long time

Signed-off-by: Felix Fietkau <[email protected]>

SVN-Revision: 44802

target/linux/omap/Makefile

@@ -13,7 +13,7 @@ FEATURES:=usb usbgadget ext4 targz fpu audio display nand ubifs
 CPU_TYPE:=cortex-a9
 CPU_SUBTYPE:=vfpv3
 
-KERNEL_PATCHVER:=3.13
+KERNEL_PATCHVER:=3.18
 
 MAINTAINER:=Imre Kaloz <[email protected]>