Merge "Moving init_rate_control() to vp9_ratectrl.{c, h}."

diff --cc vp9/encoder/vp9_onyx_if.c
Simple merge

diff --cc vp9/encoder/vp9_onyx_int.h
Simple merge

diff --cc vp9/encoder/vp9_ratectrl.c
Simple merge

diff --cc vp9/encoder/vp9_ratectrl.h
Simple merge