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>
2 files changed