cpufreq: stats: Fix string format specifier mismatch

cpufreq: stats: Fix string format specifier mismatch

Fix following warning:

drivers/cpufreq/cpufreq_stats.c:63:10: warning: %d in format string (no.
1) requires 'int' but the argument type is 'unsigned int'

Fixes: 40c3bd4cfa6f ("cpufreq: stats: Defer stats update to cpufreq_stats_record_transition()")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>