cpufreq: interactive: increase sampling_down_factor and boostpulse time

now with a hotplugging driver, i need to ensure smoothness and performance at single-core mode.
since technically, 2 cores at low freq is more power hungry than 1 core at high freq, increase the amount of time spent at 600 mhz after input boost and increase the time spent at 1 ghz+

Change-Id: I193e35dec98491a4573ad7105e47da95c2f729a2