input: touchboost: remove keypad filter.

it seems that some idiot decided to bundle Bluetooth disconnect event
through the keypad filter so users were having kernel_panics in that scenario.
Also no need to call cpufreq_driver_target because
interactive's speedtask thread will push do it for us in the next timer_rate.
Since timer_rate is 30ms by default we adjust the minimum frequency
for 40ms up to input_boost_freq, then the governor will catch up.

Change-Id: I9810e4758aeef52e8da43cde7e7817bfd80b2d63
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>