Add the following hals: (1) init_nvlink to configure nvlink(s) for sysmem in HSHUB (2) enable_nvlink to switch from PCIe sysmem to nvlink sysmem, and setup atomics. Change-Id: I73d2370aaf8e0530158a1091d9efef4a8cf2aac5 Signed-off-by: Thomas Fleury <tfleury@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1648044 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> GVS: Gerrit_Virtual_Submit Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>