hwmon: (lm75) Fix tcn75 prefix

The TCN75 has its own prefix for a long time now.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>

Documentation/hwmon/lm75

@@ -23,7 +23,7 @@ Supported chips:
     Datasheet: Publicly available at the Maxim website
                http://www.maxim-ic.com/
   * Microchip (TelCom) TCN75
-    Prefix: 'lm75'
+    Prefix: 'tcn75'
     Addresses scanned: none
     Datasheet: Publicly available at the Microchip website
                http://www.microchip.com/