Enable dual arf with constant q.
Add second level arf Q adjustment when using dual arfs in constant Q mode. Previously in constant Q mode enabling dual arf hurt by ~5% but with this change the average benefit is ~1-1.5% with some mid range data points up ~10%. Note however that it still hurts on some clips including some very low motion show content. Change-Id: I5b7789a2f42a6127d9e801cc010c20a7113bdd9b