drm/i915: Shorten GAMMA_MODE_MODE_12BIT_MULTI_SEGMENTED a bit

s/GAMMA_MODE_MODE_12BIT_MULTI_SEGMENTED/GAMMA_MODE_MODE_12BIT_MULTI_SEG/
to make this thing slightly shorter.

Also fix up the platform comment while at it.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221123152638.20622-2-ville.syrjala@linux.intel.com


Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>