bootstate: don't use header in romstage code

Change-Id: I0c2943bb0889552dc384d8efb5226cd6982a4d81
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/6663
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/include/bootstate.h

@@ -19,6 +19,8 @@
 #ifndef BOOTSTATE_H
 #define BOOTSTATE_H
 
+#if !defined(__SMM__) && !defined(__PRE_RAM__)
+
 #include <string.h>
 
 /* Control debugging of the boot state machine. */
@@ -188,4 +190,5 @@ struct boot_state_init_entry {
 		.bscb = BOOT_STATE_CALLBACK_INIT(func_, arg_),	\
 	}
 
+#endif
 #endif /* BOOTSTATE_H */