NVIDIA Tegra186 (and later) MISC register block

The MISC register block found on Tegra186 and later SoCs contains registers
that can be used to identify a given chip and various strapping options.

Required properties:
- compatible: Must be:
  - Tegra186: "nvidia,tegra186-misc"
  - Tegra194: "nvidia,tegra194-misc"
  - Tegra234: "nvidia,tegra234-misc"
- reg: Should contain 2 entries: The first entry gives the physical address
       and length of the register region which contains revision and debug
       features. The second entry specifies the physical address and length
       of the register region indicating the strapping options.