image: fix initramfs image name

Preserve order of components in initramfs image filename
when doing copy from $(KDIR) to $(BIN_DIR).

Patchwork: http://patchwork.openwrt.org/patch/3811/
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 37452

include/image.mk

@@ -69,7 +69,7 @@ endef
 
 ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),)
   define Image/BuildKernel/Initramfs
-	cp $(KDIR)/vmlinux-initramfs.elf $(BIN_DIR)/$(IMG_PREFIX)-initramfs-vmlinux.elf
+	cp $(KDIR)/vmlinux-initramfs.elf $(BIN_DIR)/$(IMG_PREFIX)-vmlinux-initramfs.elf
 	$(call Image/Build/Initramfs)
   endef
 else