zynqmp: pm: Removed double declaration of pm_ipi_send functions

Functions pm_ipi_send and pm_ipi_send_sync are declared in pm_ipi.h

Signed-off-by: Filip Drazic <filip.drazic@aggios.com>
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
diff --git a/plat/xilinx/zynqmp/pm_service/pm_api_sys.c b/plat/xilinx/zynqmp/pm_service/pm_api_sys.c
index 2f2e2ed..053281e 100644
--- a/plat/xilinx/zynqmp/pm_service/pm_api_sys.c
+++ b/plat/xilinx/zynqmp/pm_service/pm_api_sys.c
@@ -36,6 +36,7 @@
 #include <arch_helpers.h>
 #include <platform.h>
 #include "pm_client.h"
+#include "pm_ipi.h"
 #include "pm_common.h"
 #include "pm_api_sys.h"