fix(tc): fix the MHUv3 interrupt name in DT

Change the interrupt name "combined-mbx" to "combined", which is the
correct naming defined in the mainline kernel.

Signed-off-by: Leo Yan <leo.yan@arm.com>
Change-Id: I8d2da2dd0e9dac2bed3963efc695a277bb5e14bd
diff --git a/fdts/tc3-4-base.dtsi b/fdts/tc3-4-base.dtsi
index 169d68f..2de5fd3 100644
--- a/fdts/tc3-4-base.dtsi
+++ b/fdts/tc3-4-base.dtsi
@@ -15,7 +15,7 @@
 #define MHU_OFFSET			0x10000
 #define MHU_MBOX_CELLS			3
 #define MHU_RX_INT_NUM			300
-#define MHU_RX_INT_NAME			"combined-mbx"
+#define MHU_RX_INT_NAME			"combined"
 
 #define MPAM_ADDR			0x0 0x5f010000 /* 0x5f01_0000 */
 #define UARTCLK_FREQ			3750000