drm/i915/crt: Use REG_BIT() & co.

Follow the modern style and use REG_BIT() & co. for the analog
port register definitions.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241107161123.16269-5-ville.syrjala@linux.intel.com


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