net: tsec: Add the compatible string "gianfar" support

Add compatible string "gianfar" support and update the
device-tree-bindings doc.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/doc/device-tree-bindings/net/fsl-tsec-phy.txt b/doc/device-tree-bindings/net/fsl-tsec-phy.txt
index 8e8574b..a44c5fd 100644
--- a/doc/device-tree-bindings/net/fsl-tsec-phy.txt
+++ b/doc/device-tree-bindings/net/fsl-tsec-phy.txt
@@ -2,7 +2,7 @@
 
 Properties:
 
-  - compatible : Should be "fsl,etsec2"
+  - compatible : Should be "fsl,etsec2" or "gianfar"
   - reg : Offset and length of the register set for the device
   - phy-handle : See ethernet.txt file in the same directory.
   - phy-connection-type : See ethernet.txt file in the same directory. This