drm/i915/dpio: Program bxt/glk PHY TX registers per-lane

Program each bxt/glk PHY TX lane with its own settings
instead of blasting them all with the same stuff via
group access.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240412175818.29217-8-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>