libweston: Use struct timespec for touch motion events

Change code related to touch motion events to use struct timespec to
represent time.

This commit is part of a larger effort to transition the Weston codebase
to struct timespec.

Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

ivi-shell/hmi-controller.c

@@ -1551,8 +1551,9 @@ pointer_move_grab_motion(struct weston_pointer_grab *grab,
 }
 
 static void
-touch_move_grab_motion(struct weston_touch_grab *grab, uint32_t time,
-		       int touch_id, wl_fixed_t x, wl_fixed_t y)
+touch_move_grab_motion(struct weston_touch_grab *grab,
+		       const struct timespec *time, int touch_id,
+		       wl_fixed_t x, wl_fixed_t y)
 {
 	struct touch_move_grab *tch_move_grab = (struct touch_move_grab *)grab;