DeviceTree updates for 4.16:

- Convert to use memblock_virt_alloc in DT code which supports bootmem
  arches. With this we can remove the arch specific
  early_init_dt_alloc_memory_arch() functions.

- Enable running the DT unittests on UML

- Use SPDX license tags on DT files

- Fix early FDT kconfig ifdef logic

- Clean-up unittest Makefile

- Fix function comment for of_irq_parse_raw

- Add missing documentation for linux,initrd-{start,end} properties

- Clean-up of binding examples using uppercase hex

- Add trivial devices W83773G and Infineon TLV493D-A1B6

- Add missing STM32 SoC bindings

- Various small binding doc fixes
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