hwmon-for-v6.1-rc4

Fix two regressions:

- Commit 54cc3dbfc10d ("hwmon: (pmbus) Add regulator supply into macro")
  resulted in regulator undercount when disabling regulators. Revert it.

- The thermal subsystem rework caused the scmi driver to no longer register
  with the thermal subsystem because index values no longer match.
  To fix the problem, the scmi driver now directly registers with the
  thermal subsystem, no longer through the hwmon core.