msm: acpuclock-7627: Prepare PLLs during init

The new clk_prepare()/clk_unprepare() APIs need to be called from
non-atomic context. Since acpuclock is used in such places as
suspend/resume which is always in atomic context we must prepare
the PLLs during init or risk the chance of enabling a PLL that
isn't prepared.

Change-Id: I3ccf8d9354b302eda52056377c40a63a7fdb382d
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>