mxssb: Properly handle the TAG LAST flag

Check if the configuration file contains the LAST option of TAG
command and if so, set up the LAST flag in the SB file.
Signed-off-by: Marek Vasut <marex@denx.de>

mxssb.c

@@ -523,7 +523,14 @@ static int sb_tag_to_command(struct sb_cmd_ctx *cctx, char *line)
 		break;
 	case 'T':	/* ROM_TAG_CMD */
 		cmd->header.tag		= ROM_TAG_CMD;
-		cmd->header.flags	= 1;	// HACK
+		tok = strtok(NULL, " ");
+		if (!tok)
+			break;
+
+		/* Check for "LAST" flag. */
+		if ((strlen(tok) == 4) && !strncmp(tok, "LAST", 3))
+			cmd->header.flags = ROM_TAG_CMD_FLAG_ROM_LAST_TAG;
+
 		/* Rest of TAG instruction is filled later. */
 		break;
 	case 'L':	/* ROM_LOAD_CMD */