Revert "Revert "cpufreq: enable sibling cpu policy sharing""

This reverts commit 3bc5f290d131a2897a2a5a6f8d7e4678fc0d28da.
Revert "Revert "cpufreq: Fix sysfs deadlock with concurrent hotplug/frequency""

This reverts commit d36ae870ac8fce426aa7a96ce0aac266708fa6cf.
Revert "Revert "cpufreq: Resolve CPUFREQ_NOTIFY issue""

This reverts commit f9b67fe42313974f3994e520c92231cf490e18e9.