cpufreq: sched: Fix kernel crash on accessing sysfs file

cpufreq: sched: Fix kernel crash on accessing sysfs file

If the cpufreq driver hasn't set the CPUFREQ_HAVE_GOVERNOR_PER_POLICY
flag, then the kernel will crash on accessing sysfs files for the sched
governor.

CPUFreq governors we can have the governor specific sysfs files in two
places:

A. /sys/devices/system/cpu/cpuX/cpufreq/<governor>
B. /sys/devices/system/cpu/cpufreq/<governor>

The case A. is for governor per policy case, where we can control the
governor tunables for each policy separately. The case B. is for system
wide tunable values.

The schedfreq governor only implements the case A. and not B.  The sysfs
files in case B will still be present in
/sys/devices/system/cpu/cpufreq/<governor>, but accessing them will
crash kernel as the governor doesn't support that.

Moreover the sched governor is pretty new and will be used only for the
ARM platforms and there is no need to support the case B at all.

Hence use policy->kobj instead of get_governor_parent_kobj(), so that we
always create the sysfs files in path A.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>