cpufreq: cpufreq_stats: Register for bL_switcher notifiers

cpufreq_stat has registered notifiers with both cpufreq and cpu core. It adds
cpu/cpu0/cpufreq/stats/ directory with a notifier of cpufreq CPUFREQ_NOTIFY and
removes this directory with a notifier to cpu core.

On bL_switcher enable/disable, cpufreq drivers notifiers gets called and they
call cpufreq_unregister(), followed by cpufreq_register(). For unregister stats
directories per cpu aren't removed, because cpu never went to dead state and cpu
notifier isn't called.

When cpufreq_register() is called, we try to add these directories again and
that simply fails, as directories were already present.

Fix these issues by registering cpufreq_stats too with bL_switcher notifiers, so
that they get unregistered and registered on switcher enable/disable.

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

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