block: sio and deadline tweaks

Signed-off-by: Andrei F <luxneb@gmail.com>
Revert "bluetooth: bcmbt: lpm: fix polarity"

This reverts commit e4139544a7794d4ad06f94043068bf3d90e022cb.
bln: better handling for wakelocks
- activate the wakelock only, if the lights are turned on
- be sure, the the wakelock gets stopped

With this, the wakelock is only active, while an ongoing bln notification is incoming. Else the device can deep sleep.
defconfig: enable bln wakelock again