mfd: ab8500-core: Add of_compatible property for ab8500-codec

Add of_compatible string to the ab8500-codec cell to allow the driver to
grab handlers such as regulators from device-tree when available.

Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index 02698da..ca6bd1c 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -1135,6 +1135,7 @@
 	},
 	{
 		.name = "ab8500-codec",
+		.of_compatible = "stericsson,ab8500-codec",
 	},
 };