m68knommu: enable Timer on coldfire 532x

This patch enables the initial Timer on coldfire 532x systems.
Without this, the scheduler will not be triggered and the system hangs,
after all sequential code is executed. It should also apply on later kernel
versions.

Signed-off-by: Christian Gieseler <christiangieseler@yahoo.de>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>