xtensa: add U-Boot image support (uImage).

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
diff --git a/arch/xtensa/boot/Makefile b/arch/xtensa/boot/Makefile
index 4453859..ff974fc 100644
--- a/arch/xtensa/boot/Makefile
+++ b/arch/xtensa/boot/Makefile
@@ -22,7 +22,7 @@
 # Subdirs for the boot loader(s)
 
 bootdir-$(CONFIG_XTENSA_PLATFORM_ISS)	 += boot-elf
-bootdir-$(CONFIG_XTENSA_PLATFORM_XT2000) += boot-redboot boot-elf
+bootdir-$(CONFIG_XTENSA_PLATFORM_XT2000) += boot-redboot boot-elf boot-uboot
 
 
 zImage Image: $(bootdir-y)
@@ -41,3 +41,4 @@
 
 boot-elf: vmlinux.bin
 boot-redboot: vmlinux.bin.gz
+boot-uboot: vmlinux.bin.gz