hwmon: (lm90) Add support for the W83L771W/G

I was wondering if that chip ever existed publicly... Apparently yes,
so add support for it.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Tested-by: Alexander Stein <alexander.stein@informatik.tu-chemnitz.de>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>

Documentation/hwmon/lm90

@@ -95,6 +95,10 @@ Supported chips:
                            0x4c, 0x4d and 0x4e
     Datasheet: Publicly available at the Maxim website
                http://www.maxim-ic.com/datasheet/index.mvp/id/4199
+  * Winbond/Nuvoton W83L771W/G
+    Prefix: 'w83l771'
+    Addresses scanned: I2C 0x4c
+    Datasheet: No longer available
   * Winbond/Nuvoton W83L771AWG/ASG
     Prefix: 'w83l771'
     Addresses scanned: I2C 0x4c
@@ -169,12 +173,16 @@ MAX6695 and MAX6696:
   * Second critical temperature limit
   * Two remote sensors
 
-W83L771AWG/ASG
-  * The AWG and ASG variants only differ in package format.
+W83L771W/G
+  * The G variant is lead-free, otherwise similar to the W.
   * Filter and alert configuration register at 0xBF
-  * Diode ideality factor configuration (remote sensor) at 0xE3
   * Moving average (depending on conversion rate)
 
+W83L771AWG/ASG
+  * Successor of the W83L771W/G, same features.
+  * The AWG and ASG variants only differ in package format.
+  * Diode ideality factor configuration (remote sensor) at 0xE3
+
 All temperature values are given in degrees Celsius. Resolution
 is 1.0 degree for the local temperature, 0.125 degree for the remote
 temperature, except for the MAX6657, MAX6658 and MAX6659 which have a