Update typeId for BufferQueueLayer and BufferStateLayer

Currently BufferQueueLayer and BufferStateLayer have typeId BufferLayer.
Changed to use more specific typeIds so they can be identified when
dumping state.

Also renamed getTypeId to getType since it was not returning an ID, but
rather a char* name

Test: adb shell dumpsys SurfaceFlinger
Change-Id: Ic80e995fa37acb2a9f21ea91bae8608657bf0bf1