libweston: Use struct timespec for key events

Change code related to key 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/ivi-shell.c

@@ -376,7 +376,7 @@ shell_destroy(struct wl_listener *listener, void *data)
 }
 
 static void
-terminate_binding(struct weston_keyboard *keyboard, uint32_t time,
+terminate_binding(struct weston_keyboard *keyboard, const struct timespec *time,
 		  uint32_t key, void *data)
 {
 	struct weston_compositor *compositor = data;