- Add an interface to class Overlay to clean up the overlay
channels. This interface will query the framebuffer device, and
will free(UNSET) them if they are in use
- hwcomposer hal will call this API during initialization
(cherry picked from commit 0d03b1b823bbf36f7adb16bb4344fc46d8748c6a)
Conflicts:
libhwcomposer/hwcomposer.cpp
Change-Id: I4a4bedfdc409913ef31c1d5f5a869db730528096