Input: i8042 - increment wakeup_count for the respective port

Call pm_wakeup_event on every interrupt. This should help us in identifying
if keyboard was a potential wake reason for the last resume.

Signed-off-by: Ravi Chandra Sadineni <ravisadineni@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>