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Add a device node for management of nvs control fifo buffers for scheduling domains. The current design consists of a master structure struct nvgpu_nvs_domain_sched_ctrl for management of users as well as control queues. Initially all users are added as non-exclusive users. Subsequent changes will add support for IOCTLS to manage opening of Send/Receive and Event buffers, querying characteristics etc. In subsequent changes, a user that tries to open a Send/Receive queue will first try to reserve itself as an exclusive user and only if that succeeds can proceed with creation of both Send/Receive queues. Exclusive users will be reset to non-exclusive users just before they close their device node handle. Jira NVGPU-8128 Change-Id: I15a83f70cd49c685510a9fd5ea4476ebb3544378 Signed-off-by: Debarshi Dutta <ddutta@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2691404 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com> GVS: Gerrit_Virtual_Submit