fdts: stm32mp1: remove second QSPI flash instance

Remove second flash node as only one must be used
by QSPI NOR driver.

Change-Id: I48189f2fdf4e0455aabe7d4cd9b2f3d36bb9cfb5
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>

fdts/stm32mp157c-ev1.dts

@@ -34,7 +34,7 @@
 
 &qspi {
 	pinctrl-names = "default";
-	pinctrl-0 = <&qspi_clk_pins_a &qspi_bk1_pins_a &qspi_bk2_pins_a>;
+	pinctrl-0 = <&qspi_clk_pins_a &qspi_bk1_pins_a>;
 	reg = <0x58003000 0x1000>, <0x70000000 0x4000000>;
 	#address-cells = <1>;
 	#size-cells = <0>;
@@ -48,15 +48,6 @@
 		#address-cells = <1>;
 		#size-cells = <1>;
 	};
-
-	flash1: mx66l51235l@1 {
-		compatible = "jedec,spi-nor";
-		reg = <1>;
-		spi-rx-bus-width = <4>;
-		spi-max-frequency = <108000000>;
-		#address-cells = <1>;
-		#size-cells = <1>;
-	};
 };
 
 &usart3 {