thermal/cpufreq_cooling: Remove structure member documentation

thermal/cpufreq_cooling: Remove structure member documentation

The structure member documentation refers to a member which does not
exist any more. Remove it.

Link: https://lore.kernel.org/all/202501220046.h3PMBCti-lkp@intel.com/
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202501220046.h3PMBCti-lkp@intel.com/
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://patch.msgid.link/20250211084712.2746705-1-daniel.lezcano@linaro.org
[ rjw: Minor changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>