fdts: stm32mp1: update for FMC2 pin muxing

Include the required FMC2 pinmux definition for the
NAND management.

Change-Id: I80333deacdf3444b2f21f17f2fb5919e569a3591
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
diff --git a/fdts/stm32mp157c-ev1.dts b/fdts/stm32mp157c-ev1.dts
index cfde8ed..51500fa 100644
--- a/fdts/stm32mp157c-ev1.dts
+++ b/fdts/stm32mp157c-ev1.dts
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
 /*
- * Copyright (C) STMicroelectronics 2017 - All Rights Reserved
+ * Copyright (C) STMicroelectronics 2017-2019 - All Rights Reserved
  * Author: Ludovic Barre <ludovic.barre@st.com> for STMicroelectronics.
  */
 /dts-v1/;
@@ -21,15 +21,14 @@
 };
 
 &fmc {
+	pinctrl-names = "default";
+	pinctrl-0 = <&fmc_pins_a>;
 	status = "okay";
 	#address-cells = <1>;
 	#size-cells = <0>;
 
 	nand: nand@0 {
 		reg = <0>;
-		nand-on-flash-bbt;
-		#address-cells = <1>;
-		#size-cells = <1>;
 	};
 };