ANDROID: fix build warning found by 0-day

The 0-day test-bot found this warning:

include/trace/hooks/thermal.h:16:25: warning: 'struct cpufreq_policy'
declared inside parameter list will not be visible outside of this
definition or declaration

Fixed by this patch.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: b3efd2ad ("ANDROID: remove inclusions from hook definition headers")
Signed-off-by: Todd Kjos <tkjos@google.com>
Change-Id: I27d178f5056ab417b24eb14ca8dcb95f0d20cac7