vp9: Use scene detection for CBR mode.
Use the scene detection for CBR mode, and use it to reset the rate control if large source sad is detected and rate correctioni fact/QP is at minimum state. Avoids large frame sizes after big content change following low content period. Only affects CBR mode for 1 pass at speeds 5, 6, 7. Change-Id: I56dd853478cd5849b32db776e9221e258998d874
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