export KERNEL_INITRAMFS_IMAGE

`Build/ubnt-erx-factory-kernel` in `target\linux\ramips\image\Makefile`
references `$(KERNEL_INITRAMFS_IMAGE)`
which is not exported

Signed-off-by: YounJae Rho <[email protected]>

SVN-Revision: 48116

include/image.mk

@@ -454,7 +454,7 @@ define Device/ExportVar
 
 endef
 define Device/Export
-  $(foreach var,$(DEVICE_VARS) DEVICE_NAME KERNEL KERNEL_INITRAMFS,$(call Device/ExportVar,$(1),$(var)))
+  $(foreach var,$(DEVICE_VARS) DEVICE_NAME KERNEL KERNEL_INITRAMFS KERNEL_INITRAMFS_IMAGE,$(call Device/ExportVar,$(1),$(var)))
   $(1) : FILESYSTEM:=$(2)
 endef