liboverlay: Remove waitForVsync, getOvPipeType APIs

Remove waitForVsync support.
Vsync will be done explicitly by clients outside of overlay.

Remove support for the unused getOvPipeType API.
Remove redundant state checks in class Overlay

Change-Id: I8b35d7868bb46b0be755833dc8f28a158d3ff104
Acked-by: Saurabh Shah <saurshah@codeaurora.org>
13 files changed