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/M5272C3.h b/include/configs/M5272C3.h
index 33c2fc0..49cf3e8 100644
--- a/include/configs/M5272C3.h
+++ b/include/configs/M5272C3.h
@@ -106,4 +106,7 @@
 #define CFG_SYS_PBDDR		0x0000
 #define CFG_SYS_PBDAT		0x0000
 #define CFG_SYS_PDCNT		0x00000000
+
+#define CFG_MCFTMR
+
 #endif				/* _M5272C3_H */