gk20a.c is used only in Linux build. It's in theory common code, but
in practice implements OS specific policies. Also implement
os/posix/gk20a.c to implement gk20a_init_gpu_characteristics(),
gk20a_get() and gk20a_put() which are called from common code.
JIRA NVGPU-596
Change-Id: I6a6079ca6d4c6a225f0dd0e1cd7c439333a704bf
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1944884
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
