dts: T1024RDB: Add ESPI slave device node

Add ESPI slave node for T1024RDB.

Signed-off-by: Xiaowei Bao <xiaowei.bao@nxp.com>
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
[Rebased]
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>

arch/powerpc/dts/t1024rdb.dts

@@ -17,6 +17,7 @@
 
 	aliases {
 		sg_2500_aqr105_phy4 = &sg_2500_aqr105_phy4;
+		spi0 = &espi0;
 	};
 
 	soc: soc@ffe000000 {
@@ -63,7 +64,18 @@
 			};
 		};
 	};
+};
 
+&espi0 {
+	status = "okay";
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		reg = <0>;
+		/* input clock */
+		spi-max-frequency = <10000000>;
+	};
 };
 
 #include "t1024si-post.dtsi"