serial: zynq: Fix incorrect reference to s5p driver

Remove this c&p error from s5p driver.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c
index 88bebed..6807f0f 100644
--- a/drivers/serial/serial_zynq.c
+++ b/drivers/serial/serial_zynq.c
@@ -180,7 +180,7 @@
 	{ }
 };
 
-U_BOOT_DRIVER(serial_s5p) = {
+U_BOOT_DRIVER(serial_zynq) = {
 	.name	= "serial_zynq",
 	.id	= UCLASS_SERIAL,
 	.of_match = zynq_serial_ids,