weston: add set zorder Api [1/1]

PD#SWPL-180389

Problem:
Add video display z-order setting pathway

Solution:
Add video display z-order setting pathway

Verify:
AH212

Change-Id: I5eba791f8ef56efdd237cd368148a01866c951b0
Signed-off-by: chen.wang1 <chen.wang1@amlogic.com>
diff --git a/libweston/compositor.c b/libweston/compositor.c
index 888af4a..8dd78c1 100644
--- a/libweston/compositor.c
+++ b/libweston/compositor.c
@@ -4106,7 +4106,8 @@
 	surface_enable_ll_mode,
 	surface_set_invisible,
 	surface_set_plane_mute,
-	surface_enable_display_time_callback
+	surface_enable_display_time_callback,
+	surface_set_video_zorder
 };
 
 static int