XE_LPD has 128 Lut entries for Degamma, with additional 3 entries for
extended range. It has 511 entries for gamma with additional 2 entries
for extended range.

v2: Updated lut size for 10bit gamma, added lut_tests (Ville)

v3: Dropped the gamma lut tests fields (Ville)
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211207071135.3660332-4-uma.shankar@intel.com