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/cobra5272.h b/include/configs/cobra5272.h
index cd50ffe..276ecc3 100644
--- a/include/configs/cobra5272.h
+++ b/include/configs/cobra5272.h
@@ -184,4 +184,6 @@
 #define CFG_SYS_PBDAT		0x0000			/* PortB value reg. */
 #define CFG_SYS_PDCNT		0x00000000		/* PortD control reg. */
 
+#define CFG_MCFTMR
+
 #endif	/* _CONFIG_COBRA5272_H */