drm/i915/color: Fix formatting issues

Fixed few formatting issues in multi-segmented load_lut().

v3: -style nitting [Jani]
    -balanced parentheses moved from patch 2 to 1 [Jani]
    -subject prefix change [Jani]
    -added commit message [Jani]
v4: -rearranged INDEX register write in ilk_read_luts()

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1569096654-24433-2-git-send-email-swati2.sharma@intel.com