Adjust full-pixel search method in real-time mode
Adjust full-pixel search method in real-time mode

Use FAST_HEX in speed 5 and 6, which covers more points than
FAST_DIAMOND and improves motion search quality.

At speed 6, RTC set borg tests showed slight quality gain (psnr
gain: 0.143%, ssim gain: 0.226%). No noticeable encoding speed
change.

Change-Id: Ifa62875d9a52ee382ec494f271382bb77d8c67bf

shyamalschandra/libvpx,Distrotech/libvpx,mbebenita/aom,shyamalschandra/libvpx,matanbs/webm.libvpx,jdm/libvpx,ShiftMediaProject/libvpx,shacklettbp/aom,shyamalschandra/libvpx,jacklicn/webm.libvpx,mbebenita/aom,webmproject/libvpx,Maria1099/webm.libvpx,kalli123/webm.libvpx,jmvalin/aom,GrokImageCompression/aom,Topopiccione/libvpx,kim42083/webm.libvpx,matanbs/vp982,jmvalin/aom,mwgoldsmith/libvpx,Distrotech/libvpx,smarter/aom,pcwalton/libvpx,charup/https---github.com-webmproject-libvpx-,Distrotech/libvpx,Acidburn0zzz/webm.libvpx,kim42083/webm.libvpx,gshORTON/webm.libvpx,stewnorriss/libvpx,mwgoldsmith/vpx,ittiamvpx/libvpx-1,shareefalis/libvpx,charup/https---github.com-webmproject-libvpx-,matanbs/vp982,smarter/aom,running770/libvpx,abwiz0086/webm.libvpx,pcwalton/libvpx,mbebenita/aom,shareefalis/libvpx,altogother/webm.libvpx,jacklicn/webm.libvpx,mwgoldsmith/libvpx,luctrudeau/aom,matanbs/vp982,VTCSecureLLC/libvpx,goodleixiao/vpx,stewnorriss/libvpx,Suvarna1488/webm.libvpx,altogother/webm.libvpx,pcwalton/libvpx,goodleixiao/vpx,VTCSecureLLC/libvpx,kleopatra999/webm.libvpx,Acidburn0zzz/webm.libvpx,felipebetancur/libvpx,Maria1099/webm.libvpx,running770/libvpx,felipebetancur/libvpx,matanbs/webm.libvpx,VTCSecureLLC/libvpx,webmproject/libvpx,kleopatra999/webm.libvpx,liqianggao/libvpx,jmvalin/aom,gshORTON/webm.libvpx,iniwf/webm.libvpx,kim42083/webm.libvpx,altogother/webm.libvpx,matanbs/webm.libvpx,liqianggao/libvpx,zofuthan/libvpx,Suvarna1488/webm.libvpx,n4t/libvpx,charup/https---github.com-webmproject-libvpx-,shareefalis/libvpx,webmproject/libvpx,Topopiccione/libvpx,kleopatra999/webm.libvpx,jmvalin/aom,VTCSecureLLC/libvpx,mbebenita/aom,smarter/aom,goodleixiao/vpx,shareefalis/libvpx,GrokImageCompression/aom,zofuthan/libvpx,openpeer/libvpx_new,ittiamvpx/libvpx-1,mwgoldsmith/vpx,felipebetancur/libvpx,iniwf/webm.libvpx,lyx2014/libvpx_c,Maria1099/webm.libvpx,Suvarna1488/webm.libvpx,jacklicn/webm.libvpx,Maria1099/webm.libvpx,VTCSecureLLC/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,liqianggao/libvpx,hsueceumd/test_hui,luctrudeau/aom,reimaginemedia/webm.libvpx,liqianggao/libvpx,openpeer/libvpx_new,goodleixiao/vpx,charup/https---github.com-webmproject-libvpx-,jdm/libvpx,lyx2014/libvpx_c,iniwf/webm.libvpx,openpeer/libvpx_new,gshORTON/webm.libvpx,Topopiccione/libvpx,lyx2014/libvpx_c,thdav/aom,Laknot/libvpx,jacklicn/webm.libvpx,reimaginemedia/webm.libvpx,Acidburn0zzz/webm.libvpx,abwiz0086/webm.libvpx,gshORTON/webm.libvpx,Acidburn0zzz/webm.libvpx,Distrotech/libvpx,n4t/libvpx,thdav/aom,Topopiccione/libvpx,mbebenita/aom,hsueceumd/test_hui,thdav/aom,openpeer/libvpx_new,jdm/libvpx,abwiz0086/webm.libvpx,running770/libvpx,ittiamvpx/libvpx,shacklettbp/aom,Suvarna1488/webm.libvpx,luctrudeau/aom,GrokImageCompression/aom,Maria1099/webm.libvpx,mwgoldsmith/vpx,shareefalis/libvpx,stewnorriss/libvpx,smarter/aom,Acidburn0zzz/webm.libvpx,goodleixiao/vpx,pcwalton/libvpx,liqianggao/libvpx,ittiamvpx/libvpx,ittiamvpx/libvpx-1,zofuthan/libvpx,abwiz0086/webm.libvpx,running770/libvpx,mwgoldsmith/vpx,stewnorriss/libvpx,thdav/aom,Distrotech/libvpx,lyx2014/libvpx_c,kim42083/webm.libvpx,shacklettbp/aom,webmproject/libvpx,Laknot/libvpx,kleopatra999/webm.libvpx,mwgoldsmith/vpx,Laknot/libvpx,smarter/aom,matanbs/vp982,hsueceumd/test_hui,luctrudeau/aom,running770/libvpx,webmproject/libvpx,reimaginemedia/webm.libvpx,ittiamvpx/libvpx-1,ittiamvpx/libvpx,shacklettbp/aom,ShiftMediaProject/libvpx,Laknot/libvpx,iniwf/webm.libvpx,pcwalton/libvpx,mwgoldsmith/libvpx,ittiamvpx/libvpx,hsueceumd/test_hui,stewnorriss/libvpx,liqianggao/libvpx,webmproject/libvpx,lyx2014/libvpx_c,jdm/libvpx,Laknot/libvpx,GrokImageCompression/aom,kalli123/webm.libvpx,matanbs/webm.libvpx,felipebetancur/libvpx,ittiamvpx/libvpx,Laknot/libvpx,altogother/webm.libvpx,shacklettbp/aom,iniwf/webm.libvpx,pcwalton/libvpx,lyx2014/libvpx_c,mwgoldsmith/libvpx,matanbs/vp982,thdav/aom,ittiamvpx/libvpx,felipebetancur/libvpx,abwiz0086/webm.libvpx,luctrudeau/aom,luctrudeau/aom,shyamalschandra/libvpx,altogother/webm.libvpx,stewnorriss/libvpx,jacklicn/webm.libvpx,charup/https---github.com-webmproject-libvpx-,abwiz0086/webm.libvpx,mbebenita/aom,mbebenita/aom,kalli123/webm.libvpx,matanbs/webm.libvpx,altogother/webm.libvpx,openpeer/libvpx_new,matanbs/vp982,kleopatra999/webm.libvpx,jacklicn/webm.libvpx,Maria1099/webm.libvpx,shyamalschandra/libvpx,thdav/aom,zofuthan/libvpx,zofuthan/libvpx,VTCSecureLLC/libvpx,Topopiccione/libvpx,jdm/libvpx,gshORTON/webm.libvpx,kleopatra999/webm.libvpx,jmvalin/aom,shyamalschandra/libvpx,iniwf/webm.libvpx,reimaginemedia/webm.libvpx,mbebenita/aom,jdm/libvpx,GrokImageCompression/aom,Topopiccione/libvpx,ShiftMediaProject/libvpx,Suvarna1488/webm.libvpx,reimaginemedia/webm.libvpx,Distrotech/libvpx,hsueceumd/test_hui,kim42083/webm.libvpx,ittiamvpx/libvpx-1,charup/https---github.com-webmproject-libvpx-,Suvarna1488/webm.libvpx,kalli123/webm.libvpx,n4t/libvpx,ShiftMediaProject/libvpx,mbebenita/aom,shacklettbp/aom,n4t/libvpx,goodleixiao/vpx,n4t/libvpx,openpeer/libvpx_new,gshORTON/webm.libvpx,smarter/aom,kim42083/webm.libvpx,zofuthan/libvpx,running770/libvpx,mwgoldsmith/libvpx,shareefalis/libvpx,hsueceumd/test_hui,matanbs/webm.libvpx,matanbs/vp982,jmvalin/aom,felipebetancur/libvpx,Acidburn0zzz/webm.libvpx,mwgoldsmith/vpx,reimaginemedia/webm.libvpx,GrokImageCompression/aom,kalli123/webm.libvpx,ittiamvpx/libvpx-1,kalli123/webm.libvpx