SB800 RAID: add kconfig option RAID_MISC_ROM_POSITION

SB800 RAID ROM require to put the misc ROM to specific position,
this patch enable user to put the RAID misc ROM to the right place
in the coreboot image.

Change-Id: I4fc64df8e091fb0cccd063826ab31a4f198942d1
Signed-off-by: Kerry She <kerry.she@amd.com>
Signed-off-by: Kerry She <shekairui@gmail.com>
Reviewed-on: http://review.coreboot.org/249
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marcj303@gmail.com>
diff --git a/src/southbridge/amd/cimx/sb800/Makefile.inc b/src/southbridge/amd/cimx/sb800/Makefile.inc
index 30c0d39..48b198d 100644
--- a/src/southbridge/amd/cimx/sb800/Makefile.inc
+++ b/src/southbridge/amd/cimx/sb800/Makefile.inc
@@ -48,5 +48,6 @@
 
 	cbfs-files-y += raid/misc.bin
 	raid/misc.bin-file := $(call strip_quotes,$(CONFIG_RAID_MISC_ROM_FILE))
+	raid/misc.bin-position := $(CONFIG_RAID_MISC_ROM_POSITION)
 	raid/misc.bin-type := raw
 endif