feat(tc): add devicetree node for AP/RSE MHU

These dts nodes are used by u-boot MHU/RSE driver to faciliate
communication with RSE over MHU.

FPGA doesn't seem to have the MHU instances which are used to
communicate with RSE so keep rse mhu disabled for fpga.

Signed-off-by: Yu Shihai <yu.shihai@arm.com>
Signed-off-by: Jackson Cooper-Driver <jackson.cooper-driver@arm.com>
Signed-off-by: Jagdish Gediya <jagdish.gediya@arm.com>
Signed-off-by: Icen Zeyada <Icen.Zeyada2@arm.com>
Change-Id: Ib10b3da09626e5beb6d6cd87b1618a143234a5d0
diff --git a/fdts/tc4.dts b/fdts/tc4.dts
index 135d30a..a715df8 100644
--- a/fdts/tc4.dts
+++ b/fdts/tc4.dts
@@ -17,6 +17,9 @@
 #define MID_CPU_PMU_COMPATIBLE		"arm,armv8-pmuv3"
 #define BIG_CPU_PMU_COMPATIBLE		"arm,armv8-pmuv3"
 
+#define RSE_MHU_TX_ADDR			49020000 /* hex */
+#define RSE_MHU_RX_ADDR			49030000 /* hex */
+
 #define ETHERNET_ADDR			64000000
 #define ETHERNET_INT			799