doc: uapi: Add document describing dma-buf semantics

Since there's a lot of confusion around this, document both the rules
and the best practices around negotiating, allocating, importing, and
using buffers when crossing context/process/device/subsystem boundaries.

This ties up all of dma-buf, formats and modifiers, and their usage.

Signed-off-by: Daniel Stone <[email protected]>
Signed-off-by: Simon Ser <[email protected]>
Reviewed-by: Simon Ser <[email protected]>
Reviewed-by: Sui Jingfeng <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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