device/oprom/realmode: Sanitize header inclusion

Alphabetise includes to avoid duplication.

Change-Id: I7fa6998cd736bad2bab4a6b1a65d48a21d6220d9
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/6415
Tested-by: build bot (Jenkins)
Reviewed-by: Isaac Christensen <isaac.christensen@se-eng.com>
diff --git a/src/device/oprom/realmode/x86.h b/src/device/oprom/realmode/x86.h
index a811a56..a0c7a90 100644
--- a/src/device/oprom/realmode/x86.h
+++ b/src/device/oprom/realmode/x86.h
@@ -52,4 +52,4 @@
 int int16_handler(void);
 int int1a_handler(void);
 
-#endif
+#endif /* __DEVICE_OPROM_REALMODE_X86_H__ */