Convert CONFIG_MCFRTC et al to Kconfig

This converts the following to Kconfig:
   CONFIG_MCFRTC
   CONFIG_SYS_MCFRTC_BASE

While at it, remove '#undef RTC_DEBUG' from these config files.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/M5373EVB_defconfig b/configs/M5373EVB_defconfig
index 6436373..ac9680b 100644
--- a/configs/M5373EVB_defconfig
+++ b/configs/M5373EVB_defconfig
@@ -41,4 +41,6 @@
 CONFIG_DM_ETH=y
 CONFIG_MCFFEC=y
 CONFIG_MII=y
+CONFIG_MCFRTC=y
+CONFIG_SYS_MCFRTC_BASE=0xFC0A8000
 CONFIG_MCFUART=y