Revert "cpufreq: interactive: fix race on governor start/stop"

This reverts commit fbd5138e3a6bcdc7d2dfce1551baab94f6004db0.
Revert "cpufreq: interactive: fix deadlock on spinlock in timer"

This reverts commit 2259485f05cd88e29f84ac12a16f3c3005194f5e.
Revert "cpufreq: interactive: don't handle transition notification if not enabled"

This reverts commit 9d4ba1f82fa8491bbbde54218e84b6c06e138720.