msm: qpnp-haptic: Process haptics asynchronously

Blocking the timed_output sysfs node due to mutex contention causes severe
device wake-up latency, as a process crucial to system resume writes to the
timed_output vibrator node every time the device is resumed via the
fingerprint reader (fingerprint reader triggers a haptic response on
success).

By processing haptics asynchronously via a worker, the timed_output sysfs
won't get stalled for long periods of time (>30ms), and thus the device
will consistently wake from sleep faster.

Change-Id: Id482be9e098a77f0859613f0ab52a6f1542b4192
Signed-off-by: Sultanxda <sultanxda@gmail.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>