Add regulator support for PLI1209BC Digital Supervisor.
Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
Link: https://lore.kernel.org/r/21b0cdb6dd72654effa451d3b1636ecd07b160e9.1645435888.git.sylv@sylv.ioSigned-off-by: Guenter Roeck <linux@roeck-us.net>