Renaming vp8_cfg to extra_cfg + cleanup.
Renaming vp8_cfg to extra_cfg + cleanup.

Change-Id: I9a67dec9c198ce1dca90c086be55ad050c5c6f6c

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valin/aom,kim42083/webm.libvpx,Maria1099/webm.libvpx,ShiftMediaProject/libvpx,shacklettbp/aom,zofuthan/libvpx,zofuthan/libvpx,Laknot/libvpx,goodleixiao/vpx,kleopatra999/webm.libvpx,abwiz0086/webm.libvpx,Suvarna1488/webm.libvpx,felipebetancur/libvpx,kalli123/webm.libvpx,mbebenita/aom,hsueceumd/test_hui,ittiamvpx/libvpx,Suvarna1488/webm.libvpx,matanbs/webm.libvpx,GrokImageCompression/aom,openpeer/libvpx_new,Maria1099/webm.libvpx