blackfin: rename vmImage to uImage after we move to buildroot

rename vmImage to uImage
update blackfin targets name

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Steven Miao <realmz6@gmail.com>
diff --git a/arch/blackfin/Makefile b/arch/blackfin/Makefile
index 66cf000..1fce086 100644
--- a/arch/blackfin/Makefile
+++ b/arch/blackfin/Makefile
@@ -141,11 +141,11 @@
 
 INSTALL_PATH ?= /tftpboot
 boot := arch/$(ARCH)/boot
-BOOT_TARGETS = vmImage vmImage.bin vmImage.bz2 vmImage.gz vmImage.lzma vmImage.lzo vmImage.xip
+BOOT_TARGETS = uImage uImage.bin uImage.bz2 uImage.gz uImage.lzma uImage.lzo uImage.xip
 PHONY += $(BOOT_TARGETS) install
-KBUILD_IMAGE := $(boot)/vmImage
+KBUILD_IMAGE := $(boot)/uImage
 
-all: vmImage
+all: uImage
 
 $(BOOT_TARGETS): vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@