clk: msm: clock-cpu-8996: Modify the alt pll freq selection aglorithm

In order to ensure safe operation during perf cluster wakeup
from L2 power collapse modes, modify the alternate PLL
frequency selection algorithm to set it at 307.2MHz when
the primary PLL is configured to <1190.4MHz and configure
it to 556.8MHz when the primary PLL is configured to >1190.4MHz.

This is a simpler and more conservative algorithm than what
is in place today. Also, eliminate the data and don't use the
algorithm for the power cluster, which never needed to configure
the alternate PLL anyway.

Change-Id: I63315ce318f2af6a3db03094e1dbb20b58778e33
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>