refactor(tc): move MHUv2 property to tc2.dts

As only TC2 uses MHUv2, move the protocol property to tc2.dts.

Change-Id: I39dd57311e1058a6aabd4cbd5028511f704dd234
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>

fdts/tc-base.dtsi

@@ -292,7 +292,6 @@
 		#mbox-cells = <2>;
 		interrupts = <GIC_SPI INT_MBOX_RX IRQ_TYPE_LEVEL_HIGH>;
 		interrupt-names = "mhu_rx";
-		arm,mhuv2-protocols = <0 1>;
 	};
 
 	mbox_db_tx: mhu@MHU_TX_ADDR {
@@ -302,7 +301,6 @@
 		clock-names = "apb_pclk";
 		#mbox-cells = <2>;
 		interrupt-names = "mhu_tx";
-		arm,mhuv2-protocols = <0 1>;
 	};
 
 	scmi {

fdts/tc2.dts

@@ -203,6 +203,14 @@
 		interrupts = <GIC_SPI 460 IRQ_TYPE_LEVEL_HIGH>;
 	};
 
+	mbox_db_rx: mhu@MHU_RX_ADDR {
+		arm,mhuv2-protocols = <0 1>;
+	};
+
+	mbox_db_tx: mhu@MHU_TX_ADDR {
+		arm,mhuv2-protocols = <0 1>;
+	};
+
 	dp0: display@DPU_ADDR {
 #if TC_SCMI_PD_CTRL_EN
 		power-domains = <&scmi_devpd (PLAT_MAX_CPUS_PER_CLUSTER + 2)>;