serial: lpuart: add new compatible fsl, ls1028a-lpuart

The official ls1028a binding of the driver uses the following as
compatibles:
  compatible = "fsl,ls1028a-lpuart";

Add the missing compatible to the driver and update the device tree.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/drivers/serial/serial_lpuart.c b/drivers/serial/serial_lpuart.c
index 2b473d7..3c9a695 100644
--- a/drivers/serial/serial_lpuart.c
+++ b/drivers/serial/serial_lpuart.c
@@ -553,6 +553,8 @@
 static const struct udevice_id lpuart_serial_ids[] = {
 	{ .compatible = "fsl,ls1021a-lpuart", .data =
 		LPUART_FLAG_REGMAP_32BIT_REG | LPUART_FLAG_REGMAP_ENDIAN_BIG },
+	{ .compatible = "fsl,ls1028a-lpuart",
+		.data = LPUART_FLAG_REGMAP_32BIT_REG },
 	{ .compatible = "fsl,imx7ulp-lpuart",
 		.data = LPUART_FLAG_REGMAP_32BIT_REG },
 	{ .compatible = "fsl,vf610-lpuart"},