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/M5208EVBE_defconfig b/configs/M5208EVBE_defconfig
index 68cfa2b..cc307ce 100644
--- a/configs/M5208EVBE_defconfig
+++ b/configs/M5208EVBE_defconfig
@@ -31,3 +31,4 @@
 CONFIG_DM_ETH=y
 CONFIG_MCFFEC=y
 CONFIG_MII=y
+CONFIG_MCFUART=y