hwmon: (pmbus/ltc2978): Add support for LTC2978A

Detect LTC2978A chip ID. Treat it as LC2978.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/Documentation/hwmon/ltc2978 b/Documentation/hwmon/ltc2978
index 6934936..a0546fc 100644
--- a/Documentation/hwmon/ltc2978
+++ b/Documentation/hwmon/ltc2978
@@ -10,10 +10,11 @@
     Prefix: 'ltc2977'
     Addresses scanned: -
     Datasheet: http://www.linear.com/product/ltc2977
-  * Linear Technology LTC2978
+  * Linear Technology LTC2978, LTC2978A
     Prefix: 'ltc2978'
     Addresses scanned: -
     Datasheet: http://www.linear.com/product/ltc2978
+    	       http://www.linear.com/product/ltc2978a
   * Linear Technology LTC3880
     Prefix: 'ltc3880'
     Addresses scanned: -