intelliactive: fix race condition when unregistering input handlers

Signed-off-by: Paul Reioux <reioux@gmail.com>
drivers/cpufreq/cpufreq_intelliactive.c: GCC 4.9.x warning fix up

Signed-off-by: Paul Reioux <reioux@gmail.com>
intelliactive: rework input register/unregister

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