Implement usage for --help and put the same information into the README, too.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2790 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

util/superiotool/superiotool.c

@@ -164,7 +164,7 @@ int main(int argc, char *argv[])
 			exit(0);
 			break;
 		case 'h':
-			printf("Usage: superiotool [-d] [-V] [-v] [-h]\n");
+			printf(USAGE);
 			exit(0);
 			break;
 		default: