cpufreq: ondemand: Remove input boost

A probably imperfect extermination of ondemand's input boost.
We rely on the universal cpu boost input handler now.

Change-Id: If4e0669920c6f2ce25f088a2e88adfb89858856b
cpufreq: ondemand: Remove sync thread feature

Syncing threads in the cpu-boost driver is sufficient.

Change-Id: I6b3f17b01b0ef6765f7de952aff329c77c781735