regulator: Updates for v5.11

This has been a quiet release for the regulator API, a few new drivers
and the usual fixes and cleanup traffic but not much else going on:

 - Optimisations for the handling of voltage enumeration, especially
   with sparse selector sets, from Claudiu Beznea.
 - Support for several ARM SCMI regulators, Dialog DA9121, NXP PF8x00,
   Qualcomm PMX55, PM8350 and PM8350c

The addition of the SCMI regulator driver (which controls regulators via
system firmware) means that we've pulled in the support for the underlying
firmware operations from the firmware tree.
Merge remote-tracking branch 'regulator/for-5.11' into regulator-next