Input: adp5588-keys - switch to using threaded interrupt

Instead of using hard interrupt handler and manually scheduling work
item to handle I2C communications, let's switch to threaded interrupt
handling.

While at that enforce the readout delay required on pre- revision 4
silicon.

Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Link: https://lore.kernel.org/r/20220528045631.289821-2-dmitry.torokhov@gmail.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>