msm: ocmem: Enable clock management on a per client basis

Avoid turning on the interface and re-mapper clocks unless they
are required explicitly for a particular OCMEM client's use case.

Change-Id: Icf0a32ba133aa72b01d718005e96cd5d2e72bfe1
Signed-off-by: Naveen Ramaraj <nramaraj@codeaurora.org>