Adding missing call to cache current backlight values.
Otherwise the brightness resets to default value on resume.
Signed-off-by: NRoman Li <Roman.Li@amd.com>
Reviewed-by: NCharlene Liu <Charlene.Liu@amd.com>
Acked-by: NHarry Wentland <harry.wentland@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>