[ARM] Add KBUILD_IMAGE target support

Add support for KBUILD_IMAGE on ARM. This takes the usual target
specifiers (zImage/Image/etc) in the same way that powerpc does
(iow, without the arch/arm/boot prefix).

Signed-off-by: Russell King <[e-mail]>

arch/arm/Makefile

···
 
 # Default target when executing plain make
 ifeq ($(CONFIG_XIP_KERNEL),y)
-all: xipImage
+KBUILD_IMAGE := xipImage
 else
-all: zImage
+KBUILD_IMAGE := zImage
 endif
+
+all:	$(KBUILD_IMAGE)
 
 boot := arch/arm/boot