vboot: #include "fmap.h" for declarations

In the spirit of include what you use actually #include
the header necessary for fmap calls.

Change-Id: I7acede51d7139234c0520281799dad3a8d33454f
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9968
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/vendorcode/google/chromeos/vboot_common.c

@@ -26,6 +26,7 @@
 #include <string.h>
 
 #include "chromeos.h"
+#include "fmap.h"
 #include "vboot_common.h"
 #include "vboot_handoff.h"