cpufreq: interactive: don't scale beyond min if the load is low

* if it's <= 5

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
cpufreq: interactive: hardcode DEFAULT_BOOSTPULSE_DURATION to 250000us

Signed-off-by: Dan Trifan <jimsth@gmail.com>