Add missed attribute for reading POUT from page 1.
It is supported by device, but has been missed in initial commit.
Fixes: 2c6fcbb21149 ("hwmon: (pmbus) Add support for MPS Multi-phase mp2975 controller")
Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20210927070740.2149290-1-vadimp@nvidia.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
 
 #define MP2975_RAIL2_FUNC      (PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | \
                                 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | \
-                                PMBUS_PHASE_VIRTUAL)
+                                PMBUS_HAVE_POUT | PMBUS_PHASE_VIRTUAL)
 
 struct mp2975_data {
        struct pmbus_driver_info info;