Revert "dma-buf: Add dma-buf heaps framework"

This reverts commit a69b0e855d3fd278ff6f09a23e1edf929538e304.

This patchset doesn't meet the UAPI requirements set out in [1] for the DRM
subsystem. Once the userspace component is reviewed and ready for merge
we can try again.

[1]- https://01.org/linuxgraphics/gfx-docs/drm/gpu/drm-uapi.html#open-source-userspace-requirements

Fixes: a69b0e855d3f ("dma-buf: Add dma-buf heaps framework")
Cc: Laura Abbott <[email protected]>
Cc: Benjamin Gaignard <[email protected]>
Cc: Sumit Semwal <[email protected]>
Cc: Liam Mark <[email protected]>
Cc: Pratik Patel <[email protected]>
Cc: Brian Starkey <[email protected]>
Cc: Vincent Donnefort <[email protected]>
Cc: Sudipto Paul <[email protected]>
Cc: Andrew F. Davis <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Chenbo Feng <[email protected]>
Cc: Alistair Strachan <[email protected]>
Cc: Hridya Valsaraju <[email protected]>
Cc: Hillf Danton <[email protected]>
Cc: [email protected]
Cc: Brian Starkey <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: "Andrew F. Davis" <[email protected]>
Cc: [email protected]
Cc: [email protected]
Acked-by: David Airlie <[email protected]>
Signed-off-by: Sean Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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