southbridge/amd/sb700: Fix build failure from merging patches out of order

Change-Id: Ib6d1be64691cf5a1c0b7464284fbae4e583f383e
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/12402
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/southbridge/amd/sb700/early_setup.c

@@ -18,6 +18,7 @@
 #define _SB700_EARLY_SETUP_C_
 
 #include <stdint.h>
+#include <option.h>
 #include <arch/acpi.h>
 #include <arch/cpu.h>
 #include <arch/io.h>