Revert "Add support for custom buffer sizes.."

This reverts commit d6eecf50919312c1dd778c5742de72bb98f98f1a.

Conflicts:

	include/gui/BufferQueue.h
	libs/gui/Android.mk
	libs/ui/Android.mk
	libs/ui/GraphicBufferAllocator.cpp

Change-Id: Ifb8e4ad20c7c4b602c936ad42d9f1db79ff2ef2d