- Introduced NativeHandle (display/types.h)
- Introduced NvGraphicBuffer (nvidia/graphic_buffer.h)
- Renamed BqQueueBufferInput to BqBufferInput
- Renamed BqQueueBufferOutput to BqBufferOutput
- BqGraphicBuffer is now defined and marshalled in a way that matches
official sw more closely, with a pointer to a NativeHandle instead of
inline flattened data and other miscellaneous junk
- Const correctness fixes
- bqSetPreallocatedBuffer now has flattening logic for BqGraphicBuffer
- bqRequestBuffer doesn't have this logic for now, passing anything other
than NULL will fail
- gfx.c updated to use the refactored buffer producer
