hwmon: (pmbus) Add Infineon PXE1610 VR driver

Added pmbus driver for the new device Infineon pxe1610
voltage regulator. It also supports similar family device
PXE1110 and PXM1310.

Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>