powerpc: dts: p2020: Remove duplicate pic@40000 node

DT node pic@40000 is defined explicitly in p2020-post.dtsi file and also
transitionally via include file pq3-mpic.dtsi. Remove duplicate definition
from p2020-post.dtsi.

No change in final DTB file.

Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/arch/powerpc/dts/p2020-post.dtsi b/arch/powerpc/dts/p2020-post.dtsi
index 3351874..ea215ab 100644
--- a/arch/powerpc/dts/p2020-post.dtsi
+++ b/arch/powerpc/dts/p2020-post.dtsi
@@ -88,18 +88,6 @@
 /include/ "pq3-mpic.dtsi"
 /include/ "pq3-mpic-timer-B.dtsi"
 
-	mpic: pic@40000 {
-		interrupt-controller;
-		#address-cells = <0>;
-		#interrupt-cells = <4>;
-		reg = <0x40000 0x40000>;
-		compatible = "fsl,mpic";
-		device_type = "open-pic";
-		big-endian;
-		single-cpu-affinity;
-		last-interrupt-source = <255>;
-	};
-
 	global-utilities@e0000 {
 		compatible = "fsl,p2020-guts";
 		reg = <0xe0000 0x1000>;