ARM: dts: AM33xx: Add the wkup_m3_ipc node

Add the Wakeup M3 IPC node for the wkup_m3_ipc driver on AM33xx SoCs.
This node uses the IPC registers, part of the Control Module, and is
therefore added as a child of the scm node.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am33xx.dtsi

@@ -153,6 +153,14 @@ scm_clocks: clocks {
 					};
 				};
 
+				wkup_m3_ipc: wkup_m3_ipc@1324 {
+					compatible = "ti,am3352-wkup-m3-ipc";
+					reg = <0x1324 0x24>;
+					interrupts = <78>;
+					ti,rproc = <&wkup_m3>;
+					mboxes = <&mailbox &mbox_wkupm3>;
+				};
+
 				scm_clockdomains: clockdomains {
 				};
 			};