iio: st_sensors: core and lsm9ds0 switch to devm_regulator_bulk_get_enable()

These drivers only turns the power on at probe and off via a custom
devm_add_action_or_reset() callback. The two regulators were handled
separately so also switch to bulk registration.
The new devm_regulator_bulk_get_enable() replaces all this boilerplate
code.

Signed-off-by: Jonathan Cameron <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Reviewed-by: Matti Vaittinen <[email protected]>
Reviewed-by: Nuno Sá <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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