If a chip only provides a single regulator, it should be named 'vout'
and not 'vout0'. Declare regulator using PMBUS_REGULATOR_ONE() to make
that happen.

Cc: Conor Dooley <conor@kernel.org>
Cc: Naresh Solanki <naresh.solanki@9elements.com>
Cc: Zev Weiss <zev@bewilderbeest.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240223-player-buckskin-01405c5889c4@spudSigned-off-by: Guenter Roeck <linux@roeck-us.net>