brcm2708: define KERNELNAME accordingly

Define KERNELNAME to Image to get the build system to copy this image
over $(KDIR) automatically for us.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 39768

target/linux/brcm2708/Makefile

@@ -25,4 +25,6 @@ define Target/Description
 	Currently produces SD Card image for Raspberry Pi.
 endef
 
+KERNELNAME="Image"
+
 $(eval $(call BuildTarget))

target/linux/brcm2708/image/Makefile

@@ -8,10 +8,6 @@ include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/image.mk
 include $(INCLUDE_DIR)/host.mk
 
-define Image/Prepare
-	cp $(LINUX_DIR)/arch/arm/boot/Image $(KDIR)/Image
-endef
-
 FAT32_BLOCK_SIZE=1024
 FAT32_BLOCKS=$(shell echo $$(($(CONFIG_BRCM2708_SD_BOOT_PARTSIZE)*1024*1024/$(FAT32_BLOCK_SIZE))))