Convert CONFIG_MCFTMR to Kconfig

This converts the following to Kconfig:
   CONFIG_MCFTMR

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/eb_cpu5282_defconfig b/configs/eb_cpu5282_defconfig
index ae1329c..e25ce5a 100644
--- a/configs/eb_cpu5282_defconfig
+++ b/configs/eb_cpu5282_defconfig
@@ -4,6 +4,7 @@
 CONFIG_ENV_SECT_SIZE=0x20000
 CONFIG_DEFAULT_DEVICE_TREE="eb_cpu5282"
 CONFIG_TARGET_EB_CPU5282=y
+CONFIG_MCFTMR=y
 CONFIG_SYS_LOAD_ADDR=0x20000
 CONFIG_SYS_EXTRA_OPTIONS="SYS_MONITOR_BASE=0xFF000400"
 CONFIG_BOOTDELAY=5