Add Nuvoton BMC NPCM7xx timer driver.

The clocksource Enable 24-bit TIMER0 and TIMER1 counters,
while TIMER0 serve as clockevent and TIMER1 serve as clocksource.
Signed-off-by: NTomer Maimon <tmaimon77@gmail.com>
Reviewed-by: NBrendan Higgins <brendanhiggins@xxxxxxxxxx>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>