cpufreq: interactive: Use parts of native boost routine

Not all governors are created equal. Set boostpulse_endtime
and floor_freq to smoothen the timer routine.

[franciscofranco] removed boostpulse_endtime from the
original commit because I'm not using it.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
cpufreq: interactive: Use frequency dependent per cpu timings

This allows in-depth testing of the timer routine.

[franciscofranco] made some structural changes to compile on top
of my governor changes. Functionality was not changed.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
cpufreq: interactive: Honor boosted state when entering idle

The old logic didn't take the boosted state in account. Just
leave the comment intact because our temporary min is not
the regular policy->min it refers to.

[franciscofranco] not using boostpulse_endtime so change it something
else.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>