net: mvpp2: finally add the PPv2.2 compatible string

Now that the mvpp2 driver has been modified to accommodate the support
for PPv2.2, we can finally advertise this support by adding the
appropriate compatible string.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/mvpp2.c b/drivers/net/mvpp2.c
index c683fff..16da28d 100644
--- a/drivers/net/mvpp2.c
+++ b/drivers/net/mvpp2.c
@@ -4541,6 +4541,10 @@
 		.compatible = "marvell,armada-375-pp2",
 		.data = MVPP21,
 	},
+	{
+		.compatible = "marvell,armada-7k-pp22",
+		.data = MVPP22,
+	},
 	{ }
 };