Merge changes from topic "enable-tegra194-compilation" into integration

* changes:
  docs: tegra: add support for Tegra194 class of SoCs
  Tegra194: smmu: add support for backup multiple smmu regs
  Tegra194: introduce tegra_mc_def.h
  Tegra194: 40-bit wide memory address space
  Tegra194: psci: rename 'percpu_data' variable