touch_synaptics: don't wait for irq events to be handled, just disable the irq

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
Sweep2wake: add vertical sweep capability and expose tunables to userspace

HUGE thanks to Dennis Rassmann <showp1984@gmail.com> for his original
sweep2wake contribution!

Signed-off-by: Paul Reioux <reioux@gmail.com>