input: ft5336: add suspend and resume support

Add power management support to ft5336. The chip can go to hibernate and
reduce power consumption to a minimum, the only way to wake it up though
is by pulsing the reset or wake signal. Only reset is implemented in the
driver right now so only allow this functionality if the reset pin is
defined.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>