ARM: dts: keystone-k2g: Add Message Manager node

Introduce the message manager node for the A15 queues on which Linux
runs. The Message Manager is primarily used for communication with
Power Management controller on K2G.
Signed-off-by: NNishanth Menon <nm@ti.com>
Signed-off-by: NSantosh Shilimkar <ssantosh@kernel.org>

arch/arm/boot/dts/keystone-k2g.dtsi

@@ -113,5 +113,17 @@
 			#gpio-cells = <2>;
 			gpio,syscon-dev = <&devctrl 0x240>;
 		};
+
+		msgmgr: msgmgr@02a00000 {
+			compatible = "ti,k2g-message-manager";
+			#mbox-cells = <2>;
+			reg-names = "queue_proxy_region",
+				    "queue_state_debug_region";
+			reg = <0x02a00000 0x400000>, <0x028c3400 0x400>;
+			interrupt-names = "rx_005",
+					  "rx_057";
+			interrupts = <GIC_SPI 324 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 327 IRQ_TYPE_LEVEL_HIGH>;
+		};
 	};
 };