drm/display/dp_mst: Add some missing kdocs for atomic MST structs

Since we're about to start adding some stuff here, we may as well fill in
any missing documentation that we forgot to write.

Signed-off-by: Lyude Paul <[email protected]>
Cc: Wayne Lin <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Fangzhi Zuo <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Imre Deak <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Sean Paul <[email protected]>
Acked-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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