EC_ADAPT: minor simplification to adaptation mechanism.
EC_ADAPT: minor simplification to adaptation mechanism.

This removes an instruction from the HW path. It also improves
BDR by 0.02% on all metrics (AWCY, High Latency,
objective-1-fast).

Change-Id: I9f8a86871e1c0db4a0704dee297acd6977abcbe4

smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,smarter/aom,smarter/aom,GrokImageCompression/aom,smarter/aom,smarter/aom,GrokImageCompression/aom