drm/nouveau: Stop unsetting mstc->port, use malloc refs

Same as we did for i915, but for nouveau this time. Additionally, we
grab a malloc reference to the port that lasts for the entire lifetime
of nv50_mstc, which gives us the guarantee that mstc->port will always
point to valid memory for as long as the mstc stays around.

Signed-off-by: Lyude Paul <[email protected]>
Reviewed-by: Ben Skeggs <[email protected]>
Cc: 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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