cmd: gpt: initialize partition table

Change in v2:
	- Fix applies to all block devices, not just MMC.

If partition init is not completed within the gpt write,
the gpt partition list will not be updated.

Signed-off-by: Kishan Dudhatra <kishan.dudhatra@siliconsignals.io>

cmd/gpt.c

@@ -643,6 +643,10 @@ static int gpt_default(struct blk_desc *blk_dev_desc, const char *str_part)
 	free(str_disk_guid);
 	free(partitions);
 
+	/* initialize partition table */
+	if (blk_enabled())
+		part_init(blk_dev_desc);
+
 	return ret;
 }