Defer deleting ExternalTextures that go out of scope during DrawLayers

Some buffers (e.g. protected content) are not pre-mapped into a
texture.  Their textures are created in drawLayers and go out of scope
at the end of drawLayers drawLayers when those temporary textures are
sent to the GPU.

This CL ensures that in those cases we defer unbinding and deleting the
temporary texture until the cleanupPostRender method is called. Also to
avoid unecessary thread hops into cleanupPostRender this CL also adds a
thread-safe check to see if cleanup is necessary. Finally, we also make
the threaded variant asynchronous to further improve the availability of
SurfaceFlinger.

Bug: 190628682
Bug: 191132989
Test: atest librenderengine_test and perfetto traces
Change-Id: Ic2f4384cd1957c928a0ef656a98eb0041e29622c