drm/i915/dp: Drop check for FEC in intel_dp_fec_compute_config

Support for FEC is already checked by intel_dp_supports_dsc() in
intel_dp_dsc_compute_config() which gets called before
intel_dp_fec_compute_config().

Therefore the check can be dropped from the helper
intel_dp_fec_compute_config().

v2: Changed commit message for clarity. (Suraj)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241217093244.3938132-5-ankit.k.nautiyal@intel.com