vp9: Adjustments to nonrd-pickmode for vbr
vp9: Adjustments to nonrd-pickmode for vbr

For VBR: (1) allow newmv mode for golden ref to
select interpolation filter (as in last ref case), and
(2) don't use the more aggressive tx-skip testing logic for large blocks.

Only affects 1 pass real-time vbr mode (speed >= 5).

PSNR/SSIM metrics on ytlive set are all positive, ~0.5-2% gain.

Change-Id: I0ffbb0a9755563a5acd6230c58236e4f19a47266

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