10.x.x/universal/backport 1375791 - lighting banding fix #7539
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Purpose of this PR
Why is this PR needed, what hard problem is it solving/fixing?
backport for https://jira.unity3d.com/browse/UUM-8787 which landed in each version except 20.3 LTS and was requested to be backported.
Small and contained fix which shouldn't cause any problems
Testing status
Manually tested on iOS device to verify whether it fixes the issue
Comments to reviewers
Notes for the reviewers you have assigned.