Enable sub8x8 inter mode with scaled ref frame in RD optimization
Enable sub8x8 inter mode with scaled ref frame in RD optimization

This commit allows the encoder to include sub8x8 inter mode with
scaled reference frame in the rate-distortion optimization scheme.

Change-Id: Ibbe9678801592826ef22566566dcdeeb008350d5

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