fix(xilinx): add console_flush() before shutdown

Add console_flush() call before shutting down in order to
ensure that console output is flushed.

Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com>
Change-Id: I5397105d2d7bf317f199b6326593bdb1c3cc75e2
diff --git a/plat/xilinx/common/pm_service/pm_svc_main.c b/plat/xilinx/common/pm_service/pm_svc_main.c
index b62b271..f9917a0 100644
--- a/plat/xilinx/common/pm_service/pm_svc_main.c
+++ b/plat/xilinx/common/pm_service/pm_svc_main.c
@@ -100,6 +100,7 @@
 
 	VERBOSE("Received IPI FIQ from firmware\n");
 
+	console_flush();
 	(void)plat_ic_acknowledge_interrupt();
 
 	ret = pm_get_callbackdata(payload, ARRAY_SIZE(payload), 0, 0);