VP9: remove x_mis, y_mis calculations
VP9: remove x_mis, y_mis calculations

Passed as arguments instead.

Change-Id: I884a90baedf772692372e6e3520702c04a968f44

mbebenita/aom,smarter/aom,Topopiccione/libvpx,mwgoldsmith/vpx,Topopiccione/libvpx,webmproject/libvpx,luctrudeau/aom,ShiftMediaProject/libvpx,smarter/aom,smarter/aom,mwgoldsmith/vpx,mwgoldsmith/libvpx,luctrudeau/aom,webmproject/libvpx,luctrudeau/aom,mbebenita/aom,ittiamvpx/libvpx-1,mwgoldsmith/vpx,mwgoldsmith/libvpx,Topopiccione/libvpx,ittiamvpx/libvpx-1,Topopiccione/libvpx,mbebenita/aom,mbebenita/aom,mwgoldsmith/vpx,smarter/aom,GrokImageCompression/aom,ShiftMediaProject/libvpx,GrokImageCompression/aom,Topopiccione/libvpx,webmproject/libvpx,mbebenita/aom,mbebenita/aom,smarter/aom,webmproject/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,GrokImageCompression/aom,GrokImageCompression/aom,webmproject/libvpx,ittiamvpx/libvpx-1,smarter/aom,luctrudeau/aom,mwgoldsmith/vpx,mwgoldsmith/vpx,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,webmproject/libvpx,mbebenita/aom,luctrudeau/aom,GrokImageCompression/aom,ittiamvpx/libvpx-1,ittiamvpx/libvpx-1,mbebenita/aom,ittiamvpx/libvpx-1,GrokImageCompression/aom,luctrudeau/aom,Topopiccione/libvpx,mbebenita/aom,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/libvpx