drm/i915/lspcon: change signature of lspcon_wait_pcon_mode()

Switch from struct intel_lspcon to struct intel_digital_port to unify.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/84a00791d3d7ee4e34c1224ef7471918546635aa.1738677489.git.jani.nikula@intel.com


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