drm/dp_mst: Add some atomic state iterator macros

Changes since v6:
 - Move EXPORT_SYMBOL() for drm_dp_mst_topology_state_funcs to this
   commit
 - Document __drm_dp_mst_state_iter_get() and note that it shouldn't be
   called directly

Signed-off-by: Lyude Paul <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Jerry Zuo <[email protected]>
Cc: Harry Wentland <[email protected]>
Cc: Juston Li <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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