staging/android/ion: delete dma_buf->kmap/unmap implemenation

There's no callers in-tree anymore.

For merging probably best to stuff this into drm-misc, since that's
where the dma-buf heaps will land too. And the resulting conflict
hopefully ensures that dma-buf heaps wont have a new ->kmap/unmap
implemenation.

Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: Laura Abbott <[email protected]>
Acked-by: Sumit Semwal <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Laura Abbott <[email protected]>
Cc: Sumit Semwal <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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