drm/i915/dvo: Rename the "active data order" bits

We have two sets of bits for DVO "data order" stuff. Rename
one set to ACT_DATA_ORDER to make it clear they are separate
bitfields.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221122120825.26338-7-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>