ARM: PRIMA2: Divorce timer-marco from local timer API

Separate the marco local timers from the local timer API. This
will allow us to remove ARM local timer support in the near future
and gets us closer to moving this driver to drivers/clocksource.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Barry Song <baohua.song@csr.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>