drm/i915/vbt: Add fields dedicated_external and dyn_port_over_tc

drm/i915/vbt: Add fields dedicated_external and dyn_port_over_tc

VBT version 264 adds new fields associated to Xe3p_LPD's new ways of
configuring SoC for TC ports and PHYs.  Update the code to match the
updates in VBT.

The new field dedicated_external is used to represent TC ports that are
connected to PHYs outside of the Type-C subsystem, meaning that they
behave like dedicated ports and don't require the extra Type-C
programming.  In an upcoming change, we will update the driver to take
this field into consideration when detecting the type of port.

The new field dyn_port_over_tc is used to inform that the TC port can be
dynamically allocated for a legacy connector in the Type-C subsystem,
which is a new feature in Xe3p_LPD.  In upcoming changes, we will use
that field in order to handle the IOM resource management programming
required for that.

Note that, when dedicated_external is set, the fields dp_usb_type_c and
tbt are tagged as "don't care" in the spec, so they should be ignored in
that case, so also add a sanitization function to take care of forcing
them to zero when dedicated_external is true.

v2:
  - Use sanitization function to force dp_usb_type_c and tbt fields to
    be zero instead of adding a
    intel_bios_encoder_is_dedicated_external() check in each of their
    respective accessor functions. (Jani)
  - Print info about dedicated external ports in print_ddi_port().
    (Jani)
v3:
  - Also zero out field dyn_port_over_tc when dedicated_external is set.
    (Imre)
  - Use intel_bios_encoder_is_dedicated_external() directly instead of
    storing return value into variable in print_ddi_port(). (Imre)
  - Also print info for dyn_port_over_tc in print_ddi_port(). (Imre)

Bspec: 20124, 68954, 74304
Cc: Imre Deak <imre.deak@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Shekhar Chauhan <shekhar.chauhan@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20251202012306.9315-2-matthew.s.atwood@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>