cpufreq: interactive: Make window alignment optional

Make sampling window alignment optional when scheduler inputs
are not enabled.

Change-Id: If69c111a3efe219cdd1e38c1f46f03404789c0bb
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>

https://github.com/xboxfanj/android_kernel_htc_msm8974/commit/6c7ca20c7f02ce419b742183452970a9759bef37