drm: document DRM_IOCTL_PRIME_HANDLE_TO_FD and PRIME_FD_TO_HANDLE

v2: mention caps, note that the IOCTLs might fail, document that
user-space needs a data structure to keep track of the
handles (Daniel V.)

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

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