[Why]
The HDR3DLUT and SHAPER memory blocks should be powered down when
they're not in use. This will reduce power consumption.

[How]
1. Write to HDR3DLUT_MEM_PWR_FORCE to put memory to shutdown
   when HDR3DLUT is not used.
2. Write to SHAPER_MEM_PWR_FORCE to put memory to shutdown
   when SHAPER is not used.
Signed-off-by: Jacky Liao <ziyu.liao@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>