drm/i915/tc: Pass intel_tc_port to internal lane mask/count helpers

drm/i915/tc: Pass intel_tc_port to internal lane mask/count helpers

Pass the intel_tc_port pointer instead of intel_digital_port to all lane
mask and count query helpers internal to intel_tc.c, to avoid the
redundant intel_digital_port -> intel_tc_port conversions.

While at it shorten the function names, keeping the intel_tc_port_
prefix only for exported functions and use the mtl_, icl_ prefixes
making it clear which platforms a given query function is specific for.

Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Link: https://lore.kernel.org/r/20250805073700.642107-17-imre.deak@intel.com
Signed-off-by: Imre Deak <imre.deak@intel.com>