clock-rpm-8994: Add CE clock voters

Multiple drivers need to vote for CE clock rate. Add voters for them
to prevent drivers overwriting others' vote.

Also change current users to use the voter clock.

Change-Id: Idf1f67401d2d1c15ba13844669c87040b9713f8b
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>