m68knommu: remove ColdFire CLOCK_DIV config option

The reality is that you do not need the abiltity to configure the
clock divider for ColdFire CPUs. It is a fixed ratio on any given
ColdFire family member. It is not the same for all ColdFire parts,
but it is always the same in a model range. So hard define the divider
for each supported ColdFire CPU type and remove the Kconfig option.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
diff --git a/arch/m68k/include/asm/m520xsim.h b/arch/m68k/include/asm/m520xsim.h
index 87f8ce7..ee89801 100644
--- a/arch/m68k/include/asm/m520xsim.h
+++ b/arch/m68k/include/asm/m520xsim.h
@@ -13,6 +13,7 @@
 
 #define	CPU_NAME		"COLDFIRE(m520x)"
 #define	CPU_INSTR_PER_JIFFY	3
+#define	MCF_BUSCLK		(MCF_CLK / 2)
 
 #include <asm/m52xxacr.h>