coresight: don't call clk apis from atomic context

Rearrange CTI clock voting to avoid calling clk_prepare_enable
and clk_disable_unprepare apis from atomic context. This will
prevent scheduling while in atomic context.

Change-Id: I0b8a484cb38d67255dc6f0ba7c6162252d1f0c8e
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>