Input: qt2160 - switch to using threaded interrupt handler

Input: qt2160 - switch to using threaded interrupt handler

Instead of using combination of normal IRQ and work item which required
careful handling on device teardown, use standard threaded interrupt that
allows communication wityh the chip over slow (I2C) bus directly in the
interrupt handler.

To support polling mode switch to standard polling support implemented by
the input core.

Link: https://lore.kernel.org/r/20230724051345.335219-2-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>