xilinx: versal: enable ipi mailbox service

Enable IPI mailbox service on versal platform.

Signed-off-by: Wendy Liang <wendy.liang@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
Change-Id: Idfba3bcd7e7b868133da0bc1d03c96db2d0bb1b7
diff --git a/plat/xilinx/versal/platform.mk b/plat/xilinx/versal/platform.mk
index eb1f0bb..638f4fb 100644
--- a/plat/xilinx/versal/platform.mk
+++ b/plat/xilinx/versal/platform.mk
@@ -38,6 +38,7 @@
 $(eval $(call add_define_val,VERSAL_CONSOLE,VERSAL_CONSOLE_ID_${VERSAL_CONSOLE}))
 
 PLAT_INCLUDES		:=	-Iplat/xilinx/common/include/			\
+				-Iplat/xilinx/common/ipi_mailbox_service/	\
 				-Iplat/xilinx/versal/include/			\
 				-Iplat/xilinx/versal/pm_service/
 
@@ -58,6 +59,7 @@
 				lib/cpus/aarch64/cortex_a72.S			\
 				plat/common/plat_psci_common.c			\
 				plat/xilinx/common/ipi.c			\
+				plat/xilinx/common/ipi_mailbox_service/ipi_mailbox_svc.c \
 				plat/xilinx/common/pm_service/pm_ipi.c		\
 				plat/xilinx/versal/bl31_versal_setup.c		\
 				plat/xilinx/versal/plat_psci.c			\