input: misc: qti-haptics: Add audio/PWM mode as per effect settings

The haptics module supports to play with audio or PWM waveform coming
from LINE-IN pin. Add audio and PWM waveform sources as per effect
settings so that effect configurations can select these play options.

Change-Id: I7f8a2b415a7ad0156e5bb61418554b5ffe2b7729
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>