libweston: Use struct timespec for button events

Change code related to button 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

@@ -1571,7 +1571,7 @@ touch_move_grab_motion(struct weston_touch_grab *grab, uint32_t time,
 
 static void
 pointer_move_workspace_grab_button(struct weston_pointer_grab *grab,
-				   uint32_t time, uint32_t button,
+				   const struct timespec *time, uint32_t button,
 				   uint32_t state_w)
 {
 	if (BTN_LEFT == button &&

ivi-shell/ivi-shell.c

@@ -450,7 +450,8 @@ activate_binding(struct weston_seat *seat,
 }
 
 static void
-click_to_activate_binding(struct weston_pointer *pointer, uint32_t time,
+click_to_activate_binding(struct weston_pointer *pointer,
+			  const struct timespec *time,
 			  uint32_t button, void *data)
 {
 	if (pointer->grab != &pointer->default_grab)