Add high bit depth support to rtc sub8x8 block coding
Add high bit depth support to rtc sub8x8 block coding

This commit adds proper buffer handle to support high bit depth
in rtc sub8x8 block coding.

Change-Id: Ibaf8a2160194121aec9ca68b8094817fed9ccaea

thdav/aom,felipebetancur/libvpx,shacklettbp/aom,shacklettbp/aom,gshORTON/webm.libvpx,webmproject/libvpx,mwgoldsmith/libvpx,Maria1099/webm.libvpx,mwgoldsmith/vpx,altogother/webm.libvpx,Topopiccione/libvpx,abwiz0086/webm.libvpx,felipebetancur/libvpx,kleopatra999/webm.libvpx,mwgoldsmith/libvpx,jacklicn/webm.libvpx,kalli123/webm.libvpx,kim42083/webm.libvpx,mwgoldsmith/vpx,GrokImageCompression/aom,gshORTON/webm.libvpx,stewnorriss/libvpx,goodleixiao/vpx,kim42083/webm.libvpx,ittiamvpx/libvpx-1,VTCSecureLLC/libvpx,shyamalschandra/libvpx,ittiamvpx/libvpx-1,luctrudeau/aom,mwgoldsmith/vpx,mwgoldsmith/libvpx,jmvalin/aom,thdav/aom,shareefalis/libvpx,abwiz0086/webm.libvpx,Suvarna1488/webm.libvpx,jmvalin/aom,felipebetancur/libvpx,openpeer/libvpx_new,VTCSecureLLC/libvpx,webmproject/libvpx,gshORTON/webm.libvpx,matanbs/webm.libvpx,jacklicn/webm.libvpx,jacklicn/webm.libvpx,altogother/webm.libvpx,mwgoldsmith/libvpx,zofuthan/libvpx,VTCSecureLLC/libvpx,stewnorriss/libvpx,shyamalschandra/libvpx,shyamalschandra/libvpx,mbebenita/aom,kalli123/webm.libvpx,ittiamvpx/libvpx-1,Maria1099/webm.libvpx,liqianggao/libvpx,matanbs/webm.libvpx,Distrotech/libvpx,smarter/aom,thdav/aom,abwiz0086/webm.libvpx,mwgoldsmith/libvpx,stewnorriss/libvpx,Distrotech/libvpx,luctrudeau/aom,matanbs/webm.libvpx,mbebenita/aom,shareefalis/libvpx,Topopiccione/libvpx,Maria1099/webm.libvpx,Distrotech/libvpx,gshORTON/webm.libvpx,running770/libvpx,jmvalin/aom,ittiamvpx/libvpx-1,openpeer/libvpx_new,Maria1099/webm.libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,kim42083/webm.libvpx,Acidburn0zzz/webm.libvpx,abwiz0086/webm.libvpx,reimaginemedia/webm.libvpx,openpeer/libvpx_new,jacklicn/webm.libvpx,shacklettbp/aom,stewnorriss/libvpx,jacklicn/webm.libvpx,stewnorriss/libvpx,matanbs/webm.libvpx,jmvalin/aom,gshORTON/webm.libvpx,Suvarna1488/webm.libvpx,kalli123/webm.libvpx,webmproject/libvpx,Distrotech/libvpx,ShiftMediaProject/libvpx,shacklettbp/aom,Topopiccione/libvpx,webmproject/libvpx,zofuthan/libvpx,reimaginemedia/webm.libvpx,luctrudeau/aom,zofuthan/libvpx,zofuthan/libvpx,ittiamvpx/libvpx-1,Maria1099/webm.libvpx,shacklettbp/aom,Suvarna1488/webm.libvpx,felipebetancur/libvpx,shyamalschandra/libvpx,running770/libvpx,goodleixiao/vpx,lyx2014/libvpx_c,reimaginemedia/webm.libvpx,thdav/aom,kleopatra999/webm.libvpx,matanbs/webm.libvpx,mbebenita/aom,luctrudeau/aom,Maria1099/webm.libvpx,altogother/webm.libvpx,Acidburn0zzz/webm.libvpx,openpeer/libvpx_new,luctrudeau/aom,GrokImageCompression/aom,thdav/aom,webmproject/libvpx,Topopiccione/libvpx,smarter/aom,Acidburn0zzz/webm.libvpx,mwgoldsmith/vpx,felipebetancur/libvpx,iniwf/webm.libvpx,zofuthan/libvpx,GrokImageCompression/aom,liqianggao/libvpx,mbebenita/aom,ShiftMediaProject/libvpx,matanbs/webm.libvpx,goodleixiao/vpx,ittiamvpx/libvpx-1,jmvalin/aom,GrokImageCompression/aom,kim42083/webm.libvpx,iniwf/webm.libvpx,kalli123/webm.libvpx,Suvarna1488/webm.libvpx,Suvarna1488/webm.libvpx,smarter/aom,kleopatra999/webm.libvpx,running770/libvpx,kalli123/webm.libvpx,goodleixiao/vpx,smarter/aom,shyamalschandra/libvpx,Suvarna1488/webm.libvpx,GrokImageCompression/aom,webmproject/libvpx,openpeer/libvpx_new,shareefalis/libvpx,kalli123/webm.libvpx,iniwf/webm.libvpx,running770/libvpx,Acidburn0zzz/webm.libvpx,goodleixiao/vpx,Acidburn0zzz/webm.libvpx,liqianggao/libvpx,abwiz0086/webm.libvpx,openpeer/libvpx_new,reimaginemedia/webm.libvpx,iniwf/webm.libvpx,gshORTON/webm.libvpx,luctrudeau/aom,abwiz0086/webm.libvpx,lyx2014/libvpx_c,VTCSecureLLC/libvpx,lyx2014/libvpx_c,liqianggao/libvpx,mbebenita/aom,shareefalis/libvpx,altogother/webm.libvpx,kleopatra999/webm.libvpx,kleopatra999/webm.libvpx,Topopiccione/libvpx,lyx2014/libvpx_c,zofuthan/libvpx,lyx2014/libvpx_c,VTCSecureLLC/libvpx,reimaginemedia/webm.libvpx,mbebenita/aom,smarter/aom,shyamalschandra/libvpx,iniwf/webm.libvpx,VTCSecureLLC/libvpx,ShiftMediaProject/libvpx,shareefalis/libvpx,reimaginemedia/webm.libvpx,running770/libvpx,smarter/aom,Acidburn0zzz/webm.libvpx,goodleixiao/vpx,altogother/webm.libvpx,Topopiccione/libvpx,thdav/aom,mbebenita/aom,liqianggao/libvpx,ShiftMediaProject/libvpx,Distrotech/libvpx,jacklicn/webm.libvpx,mwgoldsmith/vpx,stewnorriss/libvpx,mbebenita/aom,ShiftMediaProject/libvpx,kim42083/webm.libvpx,iniwf/webm.libvpx,GrokImageCompression/aom,kleopatra999/webm.libvpx,liqianggao/libvpx,running770/libvpx,shareefalis/libvpx,Distrotech/libvpx,felipebetancur/libvpx,jmvalin/aom,mbebenita/aom,lyx2014/libvpx_c,kim42083/webm.libvpx,altogother/webm.libvpx,shacklettbp/aom