dt-bindings: trivial-devices: Add acbel,fsg032

Add new Acbel FSG032 power supply to trivial devices.

Signed-off-by: Lakshmi Yadlapati <lakshmiy@us.ibm.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230413132627.3444119-3-lakshmiy@us.ibm.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>