mfd: arizona: Integrate wm8997 into Arizona mfd

The wm8997 is a compact, high-performance audio hub CODEC with SLIMbus
interfacing, for smartphones, tablets and other portable audio devices
based on the Arizona platform.

This patch integrates the wm8997 into the Arizona mfd.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/arizona-irq.c b/drivers/mfd/arizona-irq.c
index 64cd9b6..88758ab 100644
--- a/drivers/mfd/arizona-irq.c
+++ b/drivers/mfd/arizona-irq.c
@@ -208,6 +208,14 @@
 		ctrlif_error = false;
 		break;
 #endif
+#ifdef CONFIG_MFD_WM8997
+	case WM8997:
+		aod = &wm8997_aod;
+		irq = &wm8997_irq;
+
+		ctrlif_error = false;
+		break;
+#endif
 	default:
 		BUG_ON("Unknown Arizona class device" == NULL);
 		return -EINVAL;