hwmon: add MP5920 driver

Add support for MPS Hot-Swap controller mp5920. This driver exposes
telemetry and limit value readings and writings.

Signed-off-by: Alex Vdovydchenko <xzeol@yahoo.com>
Reviewed-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20240702115252.981416-3-xzeol@yahoo.com


[groeck: Use min_t() to limit length of displayed model string]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>