PM: sleep: remove trailing spaces and tabs

Run the following command to find and remove the trailing spaces and tabs:

$ find kernel/power/ -type f | xargs sed -r -i 's/[ \t]+$//'

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>