Return GPU classes in HAL get_litter_value() instead of assigning them to GPU characteristics at HAL initialization time. JIRA NVGPU-259 Change-Id: I92cbadf3bd07292a8715d30843972def879795f5 Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1593691 Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>