zynqmp: pm: Support ATF PM version check

Add SMC call to query ATF PM version. This version
can be used by Linux to match with expected version.

Signed-off-by: Rajan Vaja <rajanv@xilinx.com>
diff --git a/plat/xilinx/zynqmp/pm_service/pm_common.h b/plat/xilinx/zynqmp/pm_service/pm_common.h
index 5dcbb0d..4d03bc0 100644
--- a/plat/xilinx/zynqmp/pm_service/pm_common.h
+++ b/plat/xilinx/zynqmp/pm_service/pm_common.h
@@ -19,6 +19,11 @@
 #define PAYLOAD_ARG_CNT		6U
 #define PAYLOAD_ARG_SIZE	4U	/* size in bytes */
 
+#define ZYNQMP_TZ_VERSION_MAJOR		1
+#define ZYNQMP_TZ_VERSION_MINOR		0
+#define ZYNQMP_TZ_VERSION		((ZYNQMP_TZ_VERSION_MAJOR << 16) | \
+					ZYNQMP_TZ_VERSION_MINOR)
+
 /**
  * pm_ipi - struct for capturing IPI-channel specific info
  * @apu_ipi_id	APU IPI agent ID