[Universal][Mobile] Light Banding fixes (halfs to floats) #6355
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Purpose of this PR
Why is this PR needed, what hard problem is it solving/fixing?
As usual - need to make some calculations and Normals to use floats instead of halfs to avoid banding on Mobile devices. This was the bare minimum required to get the light rendering correctly.
Fix for (case 1375791)
Testing status
Describe what manual/automated tests were performed for this PR
Tested with repro project in the bug case with iPhone 12
Comments to reviewers
Notes for the reviewers you have assigned.