cpufreq: cpu-boost: utilize latest sched_boost API

Update sched_boost_on_input to be an unsigned int
so that it can utilize the latest sched_boost APIs.

Change-Id: I42f626c9f0112aee3bb9f37fd62d77709f03ebcf
Signed-off-by: Amir Vajid <avajid@codeaurora.org>
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>
[avilaj@codeaurora.org: Change to sysfs from module_param]
Signed-off-by: Jonathan Avila <avilaj@codeaurora.org>