Revert "drm/i915: Disable DSB usage for now"

This reverts commit 99510e1a

.

DSB is now getting disabled locally in the color management
code so we don't need to apply this big hammer via the device
info (not that we have other DSB users at the moment).

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221123152638.20622-12-ville.syrjala@linux.intel.com
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>