ARM: dts: dra7-evm-common: Fix duplicate mailbox nodes

The mailbox nodes defined in various dts files have been moved to
common dra7-ipu-dsp-common.dtsi and dra74-ipu-dsp-common.dtsi files
in commit a11a2f73 ("ARM: dts: dra7-ipu-dsp-common: Move mailboxes
into common files"), but the nodes were erroneously left out in the
dra7-evm-common.dtsi file. Fix this by removing these duplicate nodes.

Fixes: a11a2f73 ("ARM: dts: dra7-ipu-dsp-common: Move mailboxes into common files")
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/dra7-evm-common.dtsi

@@ -244,26 +244,6 @@ &mcasp3 {
 	rx-num-evt = <32>;
 };
 
-&mailbox5 {
-	status = "okay";
-	mbox_ipu1_ipc3x: mbox_ipu1_ipc3x {
-		status = "okay";
-	};
-	mbox_dsp1_ipc3x: mbox_dsp1_ipc3x {
-		status = "okay";
-	};
-};
-
-&mailbox6 {
-	status = "okay";
-	mbox_ipu2_ipc3x: mbox_ipu2_ipc3x {
-		status = "okay";
-	};
-	mbox_dsp2_ipc3x: mbox_dsp2_ipc3x {
-		status = "okay";
-	};
-};
-
 &pcie1_rc {
 	status = "okay";
 };