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/eb_cpu5282_defconfig b/configs/eb_cpu5282_defconfig
index 9bbfcf2..5b372e1 100644
--- a/configs/eb_cpu5282_defconfig
+++ b/configs/eb_cpu5282_defconfig
@@ -36,5 +36,6 @@
 CONFIG_DM_ETH=y
 CONFIG_MCFFEC=y
 CONFIG_MII=y
+CONFIG_MCFUART=y
 CONFIG_SPLASH_SCREEN=y
 CONFIG_VIDEO_VCXK=y