Update devfreq next for v6.8

Detailed description for this pull request:
1. Fix buffer overflow of trans_stat_show sysfs node on devfreq core
- Fix buffer overflow of trans_stat_show sysfs node to replace
  sprintf with scnprintf and then replace it with sysfs_emit
  according to the syfs guide.

2. Fix the timer list corruption when frequent switching of governor
by synchronizing the devfreq_moniotr_start and _stop function.
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