serial: zynq: Extend compatible string list

ZynqMP is using updated core with cdns,uart-r1p12 compatible string.

Signed-off-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c
index 3430482..112a7a2 100644
--- a/drivers/serial/serial_zynq.c
+++ b/drivers/serial/serial_zynq.c
@@ -177,6 +177,7 @@
 static const struct udevice_id zynq_serial_ids[] = {
 	{ .compatible = "xlnx,xuartps" },
 	{ .compatible = "cdns,uart-r1p8" },
+	{ .compatible = "cdns,uart-r1p12" },
 	{ }
 };