drivers: serial: mcfuart: add DT support

This patch adds devicetree support to the mcfuart.c driver
and removes non DM code.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Angelo Dureghello <angelo@sysam.it>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index fcbb0a8..8a447fd 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -559,6 +559,14 @@
 	  Choose this option to add support for UART driver on the Marvell
 	  Armada 3700 SoC. The base address is configured via DT.
 
+config MCFUART
+	bool "Freescale ColdFire UART support"
+        help
+          Choose this option to add support for UART driver on the ColdFire
+          SoC's family. The serial communication channel provides a full-duplex
+          asynchronous/synchronous receiver and transmitter deriving an
+          operating frequency from the internal bus clock or an external clock.
+
 config MXC_UART
 	bool "IMX serial port support"
 	depends on MX5 || MX6