Changes to rd balance and multi-arf bug fix.
2 pass only change to calculation of rd mult based on Q. Make a small adjustment based on frame type and also replace adjustment based on iifactor with an one based on the ambient GF/ARF boost level. Also fix multi arf bug / issue. Overall these change give an slight improvement in ssim but hurt psnr a little. Change-Id: I5e1751e3ff5390a26f543d7855059e6fbcce105e
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