msm: acpuclock-9615: 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: I3106b1ab38ec1eb0f2133878dc03d1a1a3e8b85d
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>