clk: qcom: osm: Initialize ACD when the cluster is online

The OSM clock driver currently enables ACD for the silver and
gold clusters regardless of whether they've been brought up or
not. ACD requires the cluster PLLs to be running for initialization,
a requirement which would not be met if the cluster hasn't been
brought online.
Tie the ACD initialization sequence with enabling OSM for that
cluster.

Change-Id: I4a7e7176e30b26d096645dd9ce508b7af8ae6df2
Signed-off-by: Taniya Das <tdas@codeaurora.org>