input: qti-haptics: Add module_param to enable haptics-twm config

Add a module_param to runtime enable the haptics TWM mode
configuration. This provides clients to selectively enable
haptics in TWM.

The sysfs path is sys/module/qti_haptics/parameters/haptics_twm.

Change-Id: Ic5914f90ed9abbe5230b01de682b020c1f928a41
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>