tpl_wayland_egl_thread: Partially modified event_fd processing method.

tpl_wayland_egl_thread: Partially modified event_fd processing method.

 - Partially modified the way event_fd is handled between vk_sub_thread and twe_thread.
 - Twe buffers are in draw_done state and write twice to event_fd to send event,
  but in twe_thread, event_fd may be read only once, and only one buffer may be acquired.
 - Supplemented it by adding draw_done_count to surf_source.
 - It is a valid patch only while using vk_sub_thread.

Change-Id: I341907ca1cc6466af4d5e2f6bb5173e9382d925f
Signed-off-by: joonbum.ko <joonbum.ko@samsung.com>