cmd: pxe_utils: sysboot: Add zboot support to boot x86 Linux kernel image

Add "zboot" command to the list of supported boot in the
label_boot function.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: add component tags in the summary]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/cmd/pxe_utils.c b/cmd/pxe_utils.c
index 81150b1..71c5af4 100644
--- a/cmd/pxe_utils.c
+++ b/cmd/pxe_utils.c
@@ -655,6 +655,9 @@
 	/* Try booting a Image */
 	else if (IS_ENABLED(CONFIG_CMD_BOOTZ))
 		do_bootz(cmdtp, 0, bootm_argc, bootm_argv);
+	/* Try booting an x86_64 Linux kernel image */
+	else if (IS_ENABLED(CONFIG_CMD_ZBOOT))
+		do_zboot_parent(cmdtp, 0, bootm_argc, bootm_argv, NULL);
 
 	unmap_sysmem(buf);