drm/i915/ddi: Add more sanity check to the encoder HW readout

Check for reserved register field values and conflicting
transcoder->port mappings (both MST and non-MST mappings or multiple SST
mappings).

This is also needed for the next patch to determine if a port is in MST
mode during sanitization after HW readout.

Cc: Paulo Zanoni <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: José Roberto de Souza <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Antonio Argenziano <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Reviewed-by: Clint Taylor <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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