powerpc: dts: p2020: Add Linux compatible string and property for eSDHC

Linux kernel eSDHC driver for P2020 requires additional compatible string
fsl,p2020-esdhc and interrupts property. Add them to p2020-post.dtsi file
to make U-Boot board DTS files compatible for Linux kernel.

Signed-off-by: Pali Rohár <pali@kernel.org>
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 7709f3f..d155973 100644
--- a/arch/powerpc/dts/p2020-post.dtsi
+++ b/arch/powerpc/dts/p2020-post.dtsi
@@ -32,8 +32,9 @@
 	};
 
 	esdhc: sdhc@2e000 {
-		compatible = "fsl,esdhc";
+		compatible = "fsl,p2020-esdhc", "fsl,esdhc";
 		reg = <0x2e000 0x1000>;
+		interrupts = <72 0x2 0 0>;
 		/* Filled in by U-Boot */
 		clock-frequency = <0>;
 	};