Blackfin: support embedding the environment into loader files (LDRs)

For the most part, the Blackfin processor boots files in the LDR format
rather than binary/ELF files.  So we want to export the environment as a
raw blob to the LDR utility so it can embed it at the right location.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/Makefile b/Makefile
index 285f116..2f87595 100644
--- a/Makefile
+++ b/Makefile
@@ -323,6 +323,7 @@
 		$(OBJCOPY) ${OBJCFLAGS} -O binary $< $@
 
 $(obj)u-boot.ldr:	$(obj)u-boot
+		$(obj)tools/envcrc --binary > $(obj)env-ldr.o
 		$(LDR) -T $(CONFIG_BFIN_CPU) -c $@ $< $(LDR_FLAGS)
 
 $(obj)u-boot.ldr.hex:	$(obj)u-boot.ldr