Camera: add buffer freed notification interface

To cleanup caches of obsolete buffers.
This CL addressed the input stream bit, the output
stream hook will be a followup CL.
Also cleanup some dead API in CameraDeviceBase.h

Test: fix CTS ReprocessCaptureTest
Bug: 34461678
Change-Id: I801cd81c29becaa45630ed0a5c2dab8df1278a6a