Wifi sleep power mode sysfs

0 is PM_MAX (default), 1 is PM_FAST
path is /sys/module/bcmdhd/parameters/wifi_pm

Change-Id: Ie0bc5c31f85d43f7414412d4ed9ba1b417ab2c05
lights: add a wakelock if a value of 127 is set
keeps the notification light on even when not connected to a power source.
should be reworked as this is power inefficient.