bufferhubd: Implement more DetachedBuffer logic
1/ Separate DetachedBuffer related logic into a dedicated subclass of BufferHubRPC. This actually is the right thing to do as it utilizes the PDX's client/service programming pattern better. 2/ Add IsValid() check for the DetachedBufferChannel object. 3/ Add BufferHubClient to handle general PDX operations. 4/ Add DetachedBuffer which composites a BufferHubClient. 5/ Fully functional logic of allocating a DetachedBuffer, converting it to a BufferHub-backed GraphicBuffer, then converting it back to a DetachedBuffer. Bug: 38137191 Bug: 70046255 Bug: 70912269 Test: buffer_hub-test Change-Id: I81bf9259cbbaeb29a6df2769363b5a03464e7864
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