cpufreq: interactive: Honor changed minimum frequency

This saves a few cycles in the timer routine.

Change-Id: I4c0e89094a00a0b63eae6320e6c3bdbb2d4c307e
cpufreq: interactive: Honor boosted state in several timer calculations

Change-Id: If03da12c52d89a5293e32ac918db44a00ef34884