msm: cpr: Update the dynamic quot calculation logic

Use 0.5v as multiplier instead of the 0.9v while deriving
the new quot. This will help us in the getting the
higher target quot with good functional stability.

Change-Id: I20d3773cf3d2568df99f0898ef8c06d0ea56e503
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>