clocksource/drivers/stm32: Factor out more of the clockevent code

In order to prepare the clocksource code, let's factor out the clockevent
code, split the prescaler and timer width code into separate functions.

Tested-by: Benjamin Gaignard <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Acked-by: Benjamin Gaignard <[email protected]>
Cc: Alexandre Torgue <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Maxime Coquelin <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
[ Small edits. ]
Signed-off-by: Ingo Molnar <[email protected]>

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