drm/i915/dp_mst: Use link caps for MST DSC config selection

Use the link caps helper to select the maximum DP MST link configuration
for DSC computation, instead of using the separate max rate and lane
count limits, which may not form a valid configuration after individual
configs are disabled by fallback.

Also look up the maximum rate for state computation via the configuration
mask when checking the DSC hblank expansion quirk.

This is a step towards unifying configuration selection and iteration
across connector types and between compute and fallback paths.

The state computation should likely consider all allowed configurations,
as noted in the code comment; for now keep the existing DP MST DSC
behavior of selecting the maximum BW configuration determined by the MST
connector BW config iteration order.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260701153204.4124150-22-imre.deak@intel.com

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