net: mscc: ocelot: Update DTS for Ocelot pcb120.

Update device tree for ocelot to add support for ocelot pcb120.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
diff --git a/include/dt-bindings/mscc/ocelot_data.h b/include/dt-bindings/mscc/ocelot_data.h
new file mode 100644
index 0000000..7a5a1bf
--- /dev/null
+++ b/include/dt-bindings/mscc/ocelot_data.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+/*
+ * Copyright (c) 2019 Microsemi Corporation
+ */
+
+#ifndef _OCELOT_DATA_H_
+#define _OCELOT_DATA_H_
+
+#define SERDES1G(x)     (x)
+#define SERDES1G_MAX    SERDES1G(7)
+#define SERDES6G(x)     (SERDES1G_MAX + 1 + (x))
+#define SERDES6G_MAX    SERDES6G(11)
+#define SERDES_MAX      (SERDES6G_MAX + 1)
+
+/* similar with phy_interface_t */
+#define PHY_MODE_SGMII  2
+#define PHY_MODE_QSGMII 4
+
+#endif