C2ArcProtectedGraphicAllocator allocates the protected buffer when
priorGraphicAllocation() is called, and releases the protected buffer
if all the corrresponding C2GraphicAllocations are released.

Originally, we store the the registered graphic buffers with
GraphicBuffer. Each time when fetchGraphicBlock() is called, we
call priorGraphicAllocation() to convert GraphicBuffer to
C2GraphicAllocation. The component releases the C2GraphicAllocation
after decoding a frame and passing it to framework. So at the end we
continue allocating and releasing protected buffers during decoding.

This CL changes to store C2GraphicAllocation directly. We don't call
priorGraphicAllocation() when recycling the buffer, and the registered
C2GraphicAllocations are released when resolution change or component
is destroyed.

Bug: 181541291
Test: android.media.cts.AdaptivePlaybackTest

Change-Id: Ib0cf9fe9d4609f3a566c514429d281c1c54b458d