qcom-common: ondemand: Modify Sampling Down Factor to 2

Change needed to help improve frequency scaling
in ondemand governor. Sampling Down Factor
is set to 2 in the init.qcom.post_boot.sh

Change-Id: I1f8eb4fabce24ed7076251f2cc1ac96e8dc79dd4
Merge "qcom-common: ondemand: Modify Sampling Down Factor to 2" into jb4.3