PM: EM: Fix nr_states warnings in static checks

During the static checks nr_states has been mentioned by the kernel test
robot. Fix the warning in those 2 places.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>