regmap: Updates for v5.11

This is quite a busy release for regmap with two substantial features
being added:

 - Support for register maps Soundwire 1.2 multi-byte operations,
   allowing atomic support for registers larger than a single byte.
 - Support for relaxed I/O without barriers in MMIO regmaps, allowing
   them to be used efficiently on systems where default MMIO operations
   include barriers.

There was also an addition and revert of use of the new Soundwire
support for RT715 due to build issues with the driver built in, my tests
only covered building it as a module, the patch wasn't just dropped as
it had already been merged elsewhere.
Merge remote-tracking branch 'regmap/for-5.11' into regmap-next