PM / core: fix kerneldoc comment for device_pm_wait_for_dev()

Rearrange comment to make the comment style consistent, the previous
function parameters are described first.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>