All boards for all arch's should use DTS

[galak]

• x86: Issue Move all X86 boards to device tree #3704
• ARC: Issue Convert ARC boards to device tree #4964
• NIOS2: Issue Convert NIOS2 boards to device tree #4963
• RISCV: Issue Convert riscv boards to device tree #4962
• XTENSA: Issue Convert xtensa boards to device tree #4961

[psidhu]

I hope once this occurs, we can start using dts more heavily in drivers?

[nashif]

moving to enhancement, this is not really a bug...

[galak]

Now all arch's support DTS.