Move bit_depth init out of setup_quantization
Move bit_depth init out of setup_quantization

This also fixes a compiling error under --enable-vp9_highbitdepth.

Change-Id: I9d1dcb95d3336d797eb3c23a4702c30b04355357

smarter/aom,GrokImageCompression/aom,mwgoldsmith/vpx,GrokImageCompression/aom,ittiamvpx/libvpx-1,jmvalin/aom,mwgoldsmith/vpx,mwgoldsmith/vpx,mwgoldsmith/libvpx,webmproject/libvpx,openpeer/libvpx_new,openpeer/libvpx_new,thdav/aom,openpeer/libvpx_new,GrokImageCompression/aom,webmproject/libvpx,Topopiccione/libvpx,thdav/aom,mbebenita/aom,mwgoldsmith/libvpx,smarter/aom,shacklettbp/aom,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,shacklettbp/aom,jmvalin/aom,luctrudeau/aom,jmvalin/aom,mwgoldsmith/vpx,webmproject/libvpx,jmvalin/aom,mbebenita/aom,thdav/aom,ittiamvpx/libvpx-1,thdav/aom,smarter/aom,mwgoldsmith/libvpx,ittiamvpx/libvpx-1,thdav/aom,ittiamvpx/libvpx-1,ittiamvpx/libvpx-1,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,webmproject/libvpx,mbebenita/aom,Topopiccione/libvpx,thdav/aom,shacklettbp/aom,smarter/aom,luctrudeau/aom,luctrudeau/aom,GrokImageCompression/aom,jmvalin/aom,luctrudeau/aom,jmvalin/aom,luctrudeau/aom,GrokImageCompression/aom,Topopiccione/libvpx,openpeer/libvpx_new,openpeer/libvpx_new,mwgoldsmith/libvpx,mbebenita/aom,webmproject/libvpx,mbebenita/aom,shacklettbp/aom,webmproject/libvpx,mbebenita/aom,mbebenita/aom,Topopiccione/libvpx,Topopiccione/libvpx,shacklettbp/aom,ShiftMediaProject/libvpx,mwgoldsmith/vpx,shacklettbp/aom,openpeer/libvpx_new,mbebenita/aom,mbebenita/aom,luctrudeau/aom,smarter/aom,ittiamvpx/libvpx-1,GrokImageCompression/aom,ShiftMediaProject/libvpx,Topopiccione/libvpx,smarter/aom