Remove a global copy of GPU characteristics in struct gk20a. Instead fill it at the Linux implementation of GPU characteristics IOCTL. JIRA NVGPU-388 Change-Id: Idc4ad58301d44a554777f5b969f3191a342e73fd Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1597330 Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>