ARM: dts: stm32: add jedec compatible for nor flash on stm32mp157c-ev1

This patch adds jedec compatible for spi-nor flash
on stm32mp157c-ev1 (needed with new spi-mem interface).
Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp157c-ev1.dts

@@ -201,6 +201,7 @@ &qspi {
 	status = "okay";
 
 	flash0: mx66l51235l@0 {
+		compatible = "jedec,spi-nor";
 		reg = <0>;
 		spi-rx-bus-width = <4>;
 		spi-max-frequency = <108000000>;
@@ -209,6 +210,7 @@ flash0: mx66l51235l@0 {
 	};
 
 	flash1: mx66l51235l@1 {
+		compatible = "jedec,spi-nor";
 		reg = <1>;
 		spi-rx-bus-width = <4>;
 		spi-max-frequency = <108000000>;