dts: P1010RDB: Add eSPI slave DT nodes

Add DT nodes for eSPI slave device SPI flash.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

arch/powerpc/dts/p1010rdb-pa.dts

@@ -15,3 +15,4 @@
 };
 
 /include/ "p1010si-post.dtsi"
+/include/ "p1010rdb.dtsi"

arch/powerpc/dts/p1010rdb-pa_36b.dts

@@ -15,3 +15,4 @@
 };
 
 /include/ "p1010si-post.dtsi"
+/include/ "p1010rdb.dtsi"

arch/powerpc/dts/p1010rdb.dtsi

@@ -4,6 +4,12 @@
  *
  * Copyright 2020 NXP
  */
+/ {
+	aliases {
+		spi0 = &espi0;
+	};
+};
+
 &soc {
 	i2c@3000 {
 		rtc@68 {
@@ -11,4 +17,15 @@
 			reg = <0x68>;
 		};
 	};
+
+	spi@7000 {
+		status = "okay";
+		flash@0 {
+			compatible = "jedec,spi-nor";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			reg = <0>;
+			spi-max-frequency = <10000000>; /* input clock */
+		};
+	};
 };