cpufreq: Implement input boost support to governors

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
cpufreq: interactive: Underp boosted condition

Interactive governor has its own boosted conditions built in, I should
refactor the input boost functionality in the governor but this is an
imperfect solution for now.

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>