drm/i915: Pull GAMMA_MODE write out from haswell_load_luts()

For bdw+ let's move the GAMMA_MODE write for the legacy LUT
mode into the .load_luts() funciton directly, rather than
relying on haswell_load_luts(). We'll be getting rid of
haswell_load_luts() entirely soon, and it's anyway cleaner
to have the GAMMA_MODE write in a single place.

Signed-off-by: Ville Syrjälä <[email protected]>
Reviewed-by: Matt Roper <[email protected]>
Reviewed-by: Uma Shankar <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Maarten Lankhorst <[email protected]>

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