uboot: Add ELF target

adds ELF image option to uboot

Signed-off-by: Spenser Gilliland <spenser@gillilanding.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

boot/uboot/Config.in

@@ -98,6 +98,9 @@ config BR2_TARGET_UBOOT_FORMAT_LDR
 	depends on BR2_bfin
 	bool "u-boot.ldr"
 
+config BR2_TARGET_UBOOT_FORMAT_ELF
+	bool "u-boot.elf"
+
 endchoice
 
 config BR2_TARGET_UBOOT_OMAP_IFT

boot/uboot/uboot.mk

@@ -26,7 +26,9 @@ UBOOT_SITE    = ftp://ftp.denx.de/pub/u-boot
 UBOOT_SOURCE  = u-boot-$(UBOOT_VERSION).tar.bz2
 endif
 
-ifeq ($(BR2_TARGET_UBOOT_FORMAT_KWB),y)
+ifeq ($(BR2_TARGET_UBOOT_FORMAT_ELF),y)
+UBOOT_BIN          = u-boot
+else ifeq ($(BR2_TARGET_UBOOT_FORMAT_KWB),y)
 UBOOT_BIN          = u-boot.kwb
 UBOOT_MAKE_TARGET  = $(UBOOT_BIN)
 else ifeq ($(BR2_TARGET_UBOOT_FORMAT_AIS),y)