When inhibiting or suspending a device we are sending release events for
all currently held keys and buttons, however we retain active MT slot
state, which causes issues with gesture recognition when we resume or
uninhibit.

Let's fix it by introducing, in addition to input_dev_release_keys(),
nput_mt_release_slots() that will deactivate all currently active slots.
Signed-off-by: Angela Czubak <acz@semihalf.com>
Link: https://lore.kernel.org/r/20220718151715.1052842-3-acz@semihalf.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>