clk: msm: clock-cpu: Update power/perf cluster boot frequencies

Configure the PLL to a lower frequency at early stage of boot and then
switch to higher frequency so that the voltage voting reflects to correct
mapping.

Change-Id: I5c51d8fd04db063774eaf2796e46348707b59b4c
Signed-off-by: Taniya Das <tdas@codeaurora.org>