cpufreq: ondemand: fix cpu_policy_rwsem locking

Since commit 9ed05ab177eaf54e6eff761dd9862dd0d54e30da there is no
longer a need for locking directly inside the cpu governor.
Instead its all nicely handled inside the cpufreq framework.

Removing those specific locks should fix some strange reboots with
the ondemand governor.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
defconfig: disable dt2w features

Signed-off-by: Blechd0se <alex.christ@hotmail.de>