m68knommu: add support for the ColdFire 537x family of CPUs

The ColdFire 537x family is very similar internally to the ColdFire 532x
family. So with just a little extra configuration we can configure and
target them as well.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
diff --git a/arch/m68k/Makefile b/arch/m68k/Makefile
index 2f02acf..7f7830f 100644
--- a/arch/m68k/Makefile
+++ b/arch/m68k/Makefile
@@ -45,6 +45,7 @@
 cpuflags-$(CONFIG_M54xx)	:= $(call cc-option,-mcpu=5475,-m5200)
 cpuflags-$(CONFIG_M5407)	:= $(call cc-option,-mcpu=5407,-m5200)
 cpuflags-$(CONFIG_M532x)	:= $(call cc-option,-mcpu=532x,-m5307)
+cpuflags-$(CONFIG_M537x)	:= $(call cc-option,-mcpu=537x,-m5307)
 cpuflags-$(CONFIG_M5307)	:= $(call cc-option,-mcpu=5307,-m5200)
 cpuflags-$(CONFIG_M528x)	:= $(call cc-option,-mcpu=528x,-m5307)
 cpuflags-$(CONFIG_M5275)	:= $(call cc-option,-mcpu=5275,-m5307)