- During video playback, when the external display is connected,
start the overlay channel on the right framebuffer.
- set the correct position for the new external display channel
- fix minor bug in the function getAspectRatioPosition for external
display
CRs-fixed: 336674
(cherry picked from commit 6afc95ee1197718332461c8f0ddf9cf5f94cc7aa)
Change-Id: Ifa30dfea349c2a0f133790ab2dc91527d53152f8