Fix Gallery2's bug: When using Gallery2 player, Device sometimes enters in...

Fix Gallery2's bug: When using Gallery2 player, Device sometimes enters in deep sleep by itself during video playback.

Add SCREEN_BRIGHT_WAKE_LOCK in onStart() method of MovieAcitvity,release the
lock in onStop() method.which can ensure the brightness of screen
during playing the video.

Signed-off-by: Dandan Sun <dandan.sun@nxp.com>
Change-Id: Id1694510cd8c324838696c35ac721ab7ea3ed28b