dts: P2020: Add ESPI DT nodes

Add ESPI controller DT node for P2020.

Signed-off-by: Xiaowei Bao <xiaowei.bao@nxp.com>
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/arch/powerpc/dts/p2020-post.dtsi b/arch/powerpc/dts/p2020-post.dtsi
index 4ed093d..4898945 100644
--- a/arch/powerpc/dts/p2020-post.dtsi
+++ b/arch/powerpc/dts/p2020-post.dtsi
@@ -38,6 +38,15 @@
 		clock-frequency = <0>;
 	};
 
+	espi0: spi@7000 {
+		compatible = "fsl,mpc8536-espi";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0x7000 0x1000>;
+		fsl,espi-num-chipselects = <4>;
+		status = "disabled";
+	};
+
 	/include/ "pq3-i2c-0.dtsi"
 	/include/ "pq3-i2c-1.dtsi"
 };