m68k: rename CONFIG_MCFTMR to CFG_MCFTMR

This is not a Kconfig option so changing to _CFG.

Signed-off-by: Angelo Durgehello <angelo@kernel-space.org>
diff --git a/include/configs/stmark2.h b/include/configs/stmark2.h
index 19589be..05de376 100644
--- a/include/configs/stmark2.h
+++ b/include/configs/stmark2.h
@@ -95,4 +95,6 @@
 #define CACR_STATUS			(CFG_SYS_INIT_RAM_ADDR + \
 					CFG_SYS_INIT_RAM_SIZE - 12)
 
+#define CFG_MCFTMR
+
 #endif /* __STMARK2_CONFIG_H */