System suspend sequence involves initializing the SMMU
as a part of the system suspend exit, which is currently
not present for Tegra194 platform.

Thus call tegra_smmu_init() as a part of system suspend
exit.

Change-Id: I3086301743019e05a40fd221372e7f8713f286ae
Signed-off-by: Vignesh Radhakrishnan <vigneshr@nvidia.com>