Add BitmapParams option to getFrameAtTime/getScaledFrameAtTime

Add versions of these two methods that accepts BitmapParams.
Does not change spec or behavior of existing getFrameAtTime/
getScaledFrameAtTime.

bug: 135718180
bug: 138114267
test: CTS MediaMetadataRetrieverTest; manual testing with
thumbnails saved to storage and examine the outputs.

Change-Id: I75e96dde072c94ac950f0be637cdd096e7543f10