vp8_subpixelvariance_neon: right size coeff table
vp8_subpixelvariance_neon: right size coeff table

only uint8 is required; each use only loads one value as a uint8
quiets a few type conversion warnings

Change-Id: I03dc0dc0eb01ac23a6e8673daa2b77c6c57bf1b0

openpeer/libvpx_new,webmproject/libvpx,goodleixiao/vpx,luctrudeau/aom,VTCSecureLLC/libvpx,Topopiccione/libvpx,shacklettbp/aom,mbebenita/aom,GrokImageCompression/aom,smarter/aom,mwgoldsmith/libvpx,openpeer/libvpx_new,luctrudeau/aom,ShiftMediaProject/libvpx,webmproject/libvpx,stewnorriss/libvpx,liqianggao/libvpx,running770/libvpx,webmproject/libvpx,stewnorriss/libvpx,luctrudeau/aom,ittiamvpx/libvpx-1,shyamalschandra/libvpx,openpeer/libvpx_new,jmvalin/aom,liqianggao/libvpx,ittiamvpx/libvpx-1,thdav/aom,jmvalin/aom,VTCSecureLLC/libvpx,Topopiccione/libvpx,shyamalschandra/libvpx,shyamalschandra/libvpx,mbebenita/aom,ittiamvpx/libvpx-1,smarter/aom,Topopiccione/libvpx,jmvalin/aom,zofuthan/libvpx,thdav/aom,Topopiccione/libvpx,shyamalschandra/libvpx,mbebenita/aom,thdav/aom,running770/libvpx,VTCSecureLLC/libvpx,mbebenita/aom,mwgoldsmith/vpx,VTCSecureLLC/libvpx,shacklettbp/aom,goodleixiao/vpx,liqianggao/libvpx,mbebenita/aom,openpeer/libvpx_new,smarter/aom,GrokImageCompression/aom,mwgoldsmith/libvpx,luctrudeau/aom,mwgoldsmith/libvpx,jmvalin/aom,goodleixiao/vpx,felipebetancur/libvpx,luctrudeau/aom,ShiftMediaProject/libvpx,liqianggao/libvpx,mbebenita/aom,stewnorriss/libvpx,thdav/aom,GrokImageCompression/aom,felipebetancur/libvpx,goodleixiao/vpx,felipebetancur/libvpx,zofuthan/libvpx,felipebetancur/libvpx,shyamalschandra/libvpx,stewnorriss/libvpx,shyamalschandra/libvpx,shacklettbp/aom,smarter/aom,ittiamvpx/libvpx-1,shacklettbp/aom,felipebetancur/libvpx,liqianggao/libvpx,ShiftMediaProject/libvpx,running770/libvpx,ittiamvpx/libvpx-1,jmvalin/aom,running770/libvpx,ShiftMediaProject/libvpx,thdav/aom,mwgoldsmith/vpx,Topopiccione/libvpx,GrokImageCompression/aom,smarter/aom,running770/libvpx,Topopiccione/libvpx,webmproject/libvpx,mbebenita/aom,shacklettbp/aom,mwgoldsmith/vpx,openpeer/libvpx_new,GrokImageCompression/aom,mwgoldsmith/libvpx,goodleixiao/vpx,ittiamvpx/libvpx-1,ShiftMediaProject/libvpx,mwgoldsmith/vpx,thdav/aom,webmproject/libvpx,mwgoldsmith/libvpx,shacklettbp/aom,mwgoldsmith/libvpx,felipebetancur/libvpx,zofuthan/libvpx,luctrudeau/aom,mwgoldsmith/vpx,VTCSecureLLC/libvpx,mwgoldsmith/vpx,VTCSecureLLC/libvpx,liqianggao/libvpx,stewnorriss/libvpx,mbebenita/aom,stewnorriss/libvpx,GrokImageCompression/aom,webmproject/libvpx,smarter/aom,goodleixiao/vpx,running770/libvpx,openpeer/libvpx_new,jmvalin/aom,zofuthan/libvpx,zofuthan/libvpx,mbebenita/aom,zofuthan/libvpx