drm/amd/display: revert "write default Vesa Aux backlight control in dmub"

drm/amd/display: revert "write default Vesa Aux backlight control in dmub"

This reverts commit 08f133e932cc.

Commit causing backlight darker when the system wakes up
from standby mode, and green screen w/ secondary screen only
when the system wakes up from standby mode.

Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Signed-off-by: Derek Lai <Derek.Lai@amd.com>
Signed-off-by: Matthew Stewart <matthew.stewart2@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>