platform: tegra: iommu: Cleanup unused code

platform: tegra: iommu: Cleanup unused code

tegra-smmu now gets address space properties from domains=
property in SMMU device tree node. So, devices which have DT
nodes and which do not, are initialized from map properties got
from DT.

So, __tegra_smmu_map_init_dev() is not used anymore. Clean it up.

Bug 200031968

Change-Id: I3f5f06f948a3adf0e0a96246043ce3c19396008e
Signed-off-by: Sri Krishna chowdary <schowdary@nvidia.com>
Reviewed-on: http://git-master/r/494309
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Hiroshi Doyu <hdoyu@nvidia.com>