plat: xilinx: zynqmp: Make fpga load blocking until completed

This patch makes bitstream load blocking call and waits until
bitstream is loaded successfully or return with error.
Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Tested-by: Avesh Khan <aveshk@xilinx.com>

plat/xilinx/zynqmp/pm_service/pm_api_sys.c

@@ -538,7 +538,7 @@ enum pm_ret_status pm_fpga_load(uint32_t address_low,
 	/* Send request to the PMU */
 	PM_PACK_PAYLOAD5(payload, PM_FPGA_LOAD, address_high, address_low,
 						size, flags);
-	return pm_ipi_send(primary_proc, payload);
+	return pm_ipi_send_sync(primary_proc, payload, NULL, 0);
 }
 
 /**