hwmon: (it87) Add support for fan4 and fan5

Add support for the IT8716F and IT8718F fan4 and fan5. The late
revisions of the IT8712F have these too but support is harder to add
and nobody asked for it yet, so I didn't include it.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
diff --git a/Documentation/hwmon/it87 b/Documentation/hwmon/it87
index 81ecc7e..5b704a4 100644
--- a/Documentation/hwmon/it87
+++ b/Documentation/hwmon/it87
@@ -90,7 +90,8 @@
 can't have both on a given board.
 
 The IT8716F, IT8718F and later IT8712F revisions have support for
-2 additional fans. They are not yet supported by the driver.
+2 additional fans. They are supported by the driver for the IT8716F and
+IT8718F but not for the IT8712F
 
 The IT8716F and IT8718F, and late IT8712F and IT8705F also have optional
 16-bit tachometer counters for fans 1 to 3. This is better (no more fan