Restore previous motion search bit-error scale.
The bit to error transformation got doubled as a result of going from 8-bit to 9-bit costs (change d13385ce). Use defines to derive the scale numbers and comment some of the fields. derf: -0.023 BDRATE hevcmr: +0.067 BDRATE stdhd: +0.098 BDRATE (These are substantially smaller than than the original gains from 8 to 9 bit costing.) Change-Id: I6a2b3b029b2f1415e4f90a05709b2333ec0eea9b
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