Add support for the AMD/ATI SB600 southbridge SPI functionality

This has been tested by Uwe Hermann on an RS690/SB600 board.

Corresponding to flashrom svn r351 and coreboot v2 svn r3779.

Signed-off-by: Jason Wang <Qingpei.Wang@amd.com>
Reviewed-by: Joe Bao <zheng.bao@amd.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
diff --git a/Makefile b/Makefile
index 09c68de..c79d402 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,7 @@
 	w49f002u.o 82802ab.o pm49fl00x.o sst49lf040.o en29f002a.o \
 	sst49lfxxxc.o sst_fwhub.o layout.o cbtable.o flashchips.o \
 	flashrom.o w39v080fa.o sharplhf00l04.o w29ee011.o spi.o it87spi.o \
-	ichspi.o w39v040c.o
+	ichspi.o w39v040c.o sb600spi.o
 
 all: pciutils dep $(PROGRAM)