bus: mvebu-mbus: Restore checking for coherency fabric hardware

The new mvebu-mbus driver was not checking the device tree for
coherency fabric hardware and hence was not setting the hw_io_coherency
flag in mbus_state. This prevented the mvsdio driver from operating
correctly. This patch restores the check.

Signed-off-by: Neil Greatorex <neil@fatboyfat.co.uk>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 586d03e..a0250c6 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -858,6 +858,9 @@
 		return -ENOMEM;
 	}
 
+	if (of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric"))
+		mbus->hw_io_coherency = 1;
+
 	for (win = 0; win < mbus->soc->num_wins; win++)
 		mvebu_mbus_disable_window(mbus, win);