regulator: init_data handling update

Merge series from Jerome Brunet <jbrunet@baylibre.com>:

This patchset groups the regulator patches around the init_data topic
discussed on pmbus write protect patchset [1]

[1]: https://lore.kernel.org/r/20240920-pmbus-wp-v1-0-d679ef31c483@baylibre.com