Convert CONFIG_MCFUART to Kconfig

This converts the following to Kconfig:
	CONFIG_MCFUART

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/cobra5272_defconfig b/configs/cobra5272_defconfig
index 9ab6de0..7ae7ff3 100644
--- a/configs/cobra5272_defconfig
+++ b/configs/cobra5272_defconfig
@@ -23,3 +23,4 @@
 CONFIG_MCFFEC=y
 CONFIG_MII=y
 CONFIG_BAUDRATE=19200
+CONFIG_MCFUART=y