zynqmp: Introduce zynqmp_get_bootmode

Provide a function to retrieve the bootmode.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/plat/xilinx/zynqmp/zynqmp_private.h b/plat/xilinx/zynqmp/zynqmp_private.h
index 1f5be39..228d8dc 100644
--- a/plat/xilinx/zynqmp/zynqmp_private.h
+++ b/plat/xilinx/zynqmp/zynqmp_private.h
@@ -38,5 +38,6 @@
 /* ZynqMP specific functions */
 unsigned int zynqmp_get_uart_clk(void);
 int zynqmp_is_pmu_up(void);
+unsigned int zynqmp_get_bootmode(void);
 
 #endif /* __ZYNQMP_PRIVATE_H__ */