feat(egl/gltf): add gltf support with EGL (#8980)

Co-authored-by: André <andre_miguel_costa@hotmail.com>

demos/gltf/lv_demo_gltf.c

@@ -22,6 +22,10 @@
 #define PLAY_BTN_COLOR  lv_color_hex(0x00C8535)
 #define PAUSE_BTN_COLOR lv_color_hex(0xF9A825)
 
+#ifndef LV_DEMO_GLTF_CAMERA_NUM
+    #define LV_DEMO_GLTF_CAMERA_NUM LV_GLTF_DEFAULT_CAMERA
+#endif
+
 /**********************
  *      TYPEDEFS
  **********************/
@@ -132,6 +136,8 @@ lv_obj_t * lv_demo_gltf(const char * path)
     lv_obj_add_event_cb(viewer, on_mouse_event, LV_EVENT_RELEASED, mouse_state);
     lv_obj_add_event_cb(viewer, on_mouse_event, LV_EVENT_PRESS_LOST, mouse_state);
     lv_obj_add_event_cb(viewer, on_mouse_event, LV_EVENT_DELETE, mouse_state);
+
+    lv_gltf_set_camera(viewer, LV_DEMO_GLTF_CAMERA_NUM);
     return viewer;
 }