zynqmp: Show EL level where U-Boot runs

Add one more print to make clear which EL level U-Boot runs.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
index 88fe3e8..0c9a814 100644
--- a/board/xilinx/zynqmp/zynqmp.c
+++ b/board/xilinx/zynqmp/zynqmp.c
@@ -17,6 +17,8 @@
 
 int board_init(void)
 {
+	printf("EL Level:\tEL%d\n", current_el());
+
 	return 0;
 }