Revert "display: ct3d: read and overwrite the gamma on 2 nits"

Bug: 354108352

Revert submission 2852672-global_gamma

Reason for revert: b/354108352

Reverted changes: /q/submissionid:2852672-global_gamma

Change-Id: If0266d3c2c43d1a63e14f319a0a52063d2ae990e
1 file changed