mfd: Add WM8351 support

The WM8351 is a WM8350 variant. As well as register default changes the
WM8351 has fewer voltage and current regulators than the WM8350.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
diff --git a/drivers/mfd/wm8350-i2c.c b/drivers/mfd/wm8350-i2c.c
index 8780512..8d8c932 100644
--- a/drivers/mfd/wm8350-i2c.c
+++ b/drivers/mfd/wm8350-i2c.c
@@ -97,6 +97,7 @@
 
 static const struct i2c_device_id wm8350_i2c_id[] = {
        { "wm8350", 0 },
+       { "wm8351", 0 },
        { "wm8352", 0 },
        { }
 };