drm/atomic: trim driver interface/docs

Remove the kerneldoc and EXPORT_SYMBOL which aren't used and really
shouldn't ever be used by drivers directly.

Unfortunately this means we need to move the set_writeback_fb function
around to avoid a forward decl.

Acked-by: Heiko Stuebner <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Gustavo Padovan <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Sean Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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