Blackfin: add init.elf helper code

This creates a standalone ELF that executes just the Blackfin initcode.
This is useful for people who want to program the low level aspects of
the CPU (memory/clocks/etc...) and can easily be used with JTAG for
quick booting while developing.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/Makefile b/Makefile
index e56fa02..b1e07a7 100644
--- a/Makefile
+++ b/Makefile
@@ -1075,7 +1075,8 @@
 	       $(obj)board/voiceblue/eeprom 				  \
 	       $(obj)board/armltd/{integratorap,integratorcp}/u-boot.lds  \
 	       $(obj)u-boot.lds						  \
-	       $(obj)arch/blackfin/cpu/bootrom-asm-offsets.[chs]
+	       $(obj)arch/blackfin/cpu/bootrom-asm-offsets.[chs]	  \
+	       $(obj)arch/blackfin/cpu/init.{lds,elf}
 	@rm -f $(obj)include/bmp_logo.h
 	@rm -f $(obj)lib/asm-offsets.s
 	@rm -f $(obj)nand_spl/{u-boot.lds,u-boot-nand_spl.lds,u-boot-spl,u-boot-spl.map,System.map}