intellidemand: add minimum cpu performance lock

a minimum cpu frequency performance lock is add to ensure smooth
operations when only 1 core is active

Signed-off-by: faux123 <reioux@gmail.com>

Conflicts:
	drivers/cpufreq/Kconfig

Conflicts:

	drivers/cpufreq/Kconfig

Change-Id: Ib65974a2e19ea1c9cbb6de458c53a0df26dde8a8