mfd: arizona: Add support for WM8280/WM8281

This adds support for the Wolfson Microelectronics WM8280 and WM8281
codecs.

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
[Lee: Minor fixup to remove potentially uninitialised variable. ]
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/arizona-irq.c b/drivers/mfd/arizona-irq.c
index 3a3fe7c..d063b94 100644
--- a/drivers/mfd/arizona-irq.c
+++ b/drivers/mfd/arizona-irq.c
@@ -211,6 +211,7 @@
 #endif
 #ifdef CONFIG_MFD_WM5110
 	case WM5110:
+	case WM8280:
 		aod = &wm5110_aod;
 
 		switch (arizona->rev) {