Move sched parameter APIs to be Linux specific implementation. At
the same time the sched_ctrl fields were moved to nvgpu_os_linux.
JIRA NVGPU-259
Change-Id: I2397e2602e1c4783f2bebf3aec462634b7f86d4a
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1580649
GVS: Gerrit_Virtual_Submit