serial: uartlite: Move driver to DM

Enable SPL DM too.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Thomas Chou <thomas@wytron.com.tw>
diff --git a/doc/device-tree-bindings/serial/xilinx_uartlite.txt b/doc/device-tree-bindings/serial/xilinx_uartlite.txt
new file mode 100644
index 0000000..d15753c
--- /dev/null
+++ b/doc/device-tree-bindings/serial/xilinx_uartlite.txt
@@ -0,0 +1,13 @@
+Binding for Xilinx Uartlite Controller
+
+Required properties:
+- compatible : should be "xlnx,xps-uartlite-1.00.a", or "xlnx,opb-uartlite-1.00.b"
+- reg: Should contain UART controller registers location and length.
+- interrupts: Should contain UART controller interrupts.
+
+Example:
+	serial@40600000 {
+		compatible = "xlnx,xps-uartlite-1.00.a";
+		interrupts = <1 0>;
+		reg = <0x40600000 0x10000>;
+	};