msm: cpr: Adjust the expanded target quot equation

As per the CPR characterization data on the 8625, the expanded
quot equation should use the 600 as the offset to calculate the
target quot.

Change-Id: I030e26cf5254418359300ed8123e9546cfac8888
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>