hwmon: (pmbus/lm25066) Report VAUX as vmon

So far the driver reported the voltage on VAUX as "vout2". This was not
entirely appropriate as it is not an output voltage, and complicates
the code. Use the new virtual "VMON" register set and report the voltage
as "vmon" instead.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/lm25066

@@ -60,14 +60,14 @@ in1_max			Maximum input voltage.
 in1_min_alarm		Input voltage low alarm.
 in1_max_alarm		Input voltage high alarm.
 
-in2_label		"vout1"
-in2_input		Measured output voltage.
-in2_average		Average measured output voltage.
-in2_min			Minimum output voltage.
-in2_min_alarm		Output voltage low alarm.
+in2_label		"vmon"
+in2_input		Measured voltage on VAUX pin
 
-in3_label		"vout2"
-in3_input		Measured voltage on vaux pin
+in3_label		"vout1"
+in3_input		Measured output voltage.
+in3_average		Average measured output voltage.
+in3_min			Minimum output voltage.
+in3_min_alarm		Output voltage low alarm.
 
 curr1_label		"iin"
 curr1_input		Measured input current.