[PATCHv6 1/2] regmap: add DT endianness binding support.

For many drivers which will support rich endianness of Devices need define DT properties by itself with the binding support. The endianness using regmap: Index Device Properties if needs bytes-swap, or just ignore it

[PATCHv6 1/2] regmap: add DT endianness binding support.

For many drivers which will support rich endianness of Devices need define DT properties by itself with the binding support. The endianness using regmap: Index Device Properties if needs bytes-swap, or just ignore it