Input: i8042 - attach fwnode to serio i8042 kbd device

Attach the firmware node to the serio i8042 kbd device so that device
properties can be passed from the firmware.

Signed-off-by: Rajat Jain <rajatja@google.com>
Link: https://lore.kernel.org/r/20200427210259.91330-1-rajatja@google.com


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