Daniel Jacobowitz 042eb37a04 Fix Linux task preemption on Versatile board
Recent versions of the Linux kernel will not preempt CPU-intensive
tasks unless the clock used by sched_clock() works.  On -M versatilepb
that's the 24MHz timer in the system controller.  It's a very simple
timer, so implement it.

Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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