mxsboot: fix tool name in usage message

Signed-off-by: NOtavio Salvador <otavio@ossystems.com.br>

tools/mxsboot.c

@@ -453,7 +453,7 @@ static int mx28_nand_write_firmware(struct mx28_nand_fcb *fcb, int infd,
 void usage(void)
 {
 	printf(
-		"Usage: mx28image [ops] <type> <infile> <outfile>\n"
+		"Usage: mxsboot [ops] <type> <infile> <outfile>\n"
 		"Augment BootStream file with a proper header for i.MX28 boot\n"
 		"\n"
 		"  <type>	type of image:\n"