vp9_loopfilter.c : todo cleanup
vp9_loopfilter.c : todo cleanup

Removed this todo because of another todo which says none of this code
should exist. It should be integrated into the block by block encode
process as per the decoder.

Change-Id: I076bd15140a060e69c014dd7d7cd07fea260aba3

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