ACPI / PMIC: Convert to use builtin_platform_driver() macro

All of PMIC OpRegion drivers can't be modules, thus, convert them to use
builtin_platform_driver() macro and remove redundant MODULE_*() macros.

No functional change intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>