Staging: rtl8187se: cleanup r8180_pm.c

* remove unused rtl8180_{save_state,enable_wake}()
* remove commented out code
* beautify code

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>