expo: Adjust how menu items are highlighted

At present when the user moves to a new menu item, the menu code
handles this immediately. This means it is not possible to use an expo
action to effect the same change.

Update this so that EXPOACT_POINT_ITEM is handled in cedit_do_action().

Expand the test to cover this.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/boot/bootflow_menu.c b/boot/bootflow_menu.c
index 268c93a..f9ebc52 100644
--- a/boot/bootflow_menu.c
+++ b/boot/bootflow_menu.c
@@ -180,6 +180,7 @@
 {
 	struct bootflow *sel_bflow;
 	struct udevice *dev;
+	struct scene *scn;
 	struct expo *exp;
 	uint sel_id;
 	bool done;
@@ -209,6 +210,9 @@
 	ret = expo_set_scene_id(exp, MAIN);
 	if (ret)
 		return log_msg_ret("scn", ret);
+	scn = expo_lookup_scene_id(exp, MAIN);
+	if (!scn)
+		return log_msg_ret("scn", -ENOENT);
 
 	if (text_mode)
 		expo_set_text_mode(exp, text_mode);
@@ -224,6 +228,12 @@
 				sel_id = act.select.id;
 				done = true;
 				break;
+			case EXPOACT_POINT_ITEM:
+				ret = scene_menu_select_item(scn,
+						OBJ_MENU, act.select.id);
+				if (ret)
+					return log_msg_ret("bmp", ret);
+				break;
 			case EXPOACT_QUIT:
 				return -EPIPE;
 			default: