drm/i915/rkl: Don't try to read out DSI transcoders

RKL doesn't have DSI outputs, so we shouldn't try to read out the DSI
transcoder registers.

v2(MattR):
 - Just set the 'extra panel mask' to edp | dsi0 | dsi1 and then mask
   against the platform's cpu_transcoder_mask to filter out the ones
   that don't exist on a given platform.  (Ville)

v3(MattR):
 - Only include DSI transcoders on gen11+ again. (Ville)
 - Use for_each_cpu_transcoder_masked() for loop. (Ville)

Cc: Ville Syrjälä <[email protected]>
Signed-off-by: Aditya Swarup <[email protected]>
Signed-off-by: Matt Roper <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Ville Syrjälä <[email protected]>

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