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/arch/m68k/cpu/mcf5445x/interrupts.c b/arch/m68k/cpu/mcf5445x/interrupts.c
index ea0cf87..fb80a87 100644
--- a/arch/m68k/cpu/mcf5445x/interrupts.c
+++ b/arch/m68k/cpu/mcf5445x/interrupts.c
@@ -26,7 +26,7 @@
 	return 0;
 }
 
-#if defined(CONFIG_MCFTMR)
+#if defined(CFG_MCFTMR)
 void dtimer_intr_setup(void)
 {
 	int0_t *intp = (int0_t *) (CFG_SYS_INTR_BASE);