powerpc: dts: p2020: Add missing interrupts property to spi@7000 node

interrupts property for spi@7000 node is needed for compatibility with
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 248b504..2135710 100644
--- a/arch/powerpc/dts/p2020-post.dtsi
+++ b/arch/powerpc/dts/p2020-post.dtsi
@@ -44,6 +44,7 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 		reg = <0x7000 0x1000>;
+		interrupts = < 0x3b 0x02 0x00 0x00 >;
 		fsl,espi-num-chipselects = <4>;
 	};