cpufreq: interactive: Consider changed min limit a frequency boost

A changed policy->min can safely be considered a frequency boost.
Process this change analogous to the cpufreq_interactive_boost()
routine.

Change-Id: Ie4ca2be2dad0f5bd541c2b79afee3bad3a349d80
cpufreq: interactive: Honor boosted state in several timer calculations

Change-Id: If03da12c52d89a5293e32ac918db44a00ef34884
Revert "cpufreq: interactive: Simplify frequency calculations"

This reverts commit 12eb52bcb246dd92b1e07725ce8778d62d557bc4.

We'll use this a bit smarter.

Change-Id: I0ca9f10f01720cc03de9b7084262ebf3a3a0e9e3