Delete gm20b vgpu support. It has not been supported for a long time and keeping it up-to-date is extra work. Change-Id: I3c06d29a79cb83d53a25d2242247b4eeabeab310 Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1635126 Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>