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drm_hwcomposer: Use DUMB buffer for modeset

Roman Stratiienko requested to merge roman.stratiienko/drm-hwcomposer:use-dumb-for-modeset into main

Now, as the LayerProperties struct accepts BufferInfo and BufferInfo can carry the RAII-wrapped dmabuf FD, it has become elementary to use dumb buffer for a modeset.

There are two benefits compared to using the gralloc:

  1. We aim to make the DRM composer backend Android-agnostic.
  2. Not every gralloc may support mapping the HWFB buffer.

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