interactive: apply extra savings when screen-off

 - Disable mode change
 - Don't boost with hispeed_freq

Signed-off-by: arter97 <qkrwngud825@gmail.com>

Based on commit: https://bitbucket.org/arter97/android_kernel_samsung_exynos7420/commits/70c06df1778f90b627f7f3d2b3cce9cc8e4447bb