Input: goodix_berlin - use __free() cleanup in SPI transport

Switch the driver to use __free(kfree) cleanup facility instead of
freeing memory by hand.

Link: https://lore.kernel.org/r/Zmk1SGwVt3rIbbMU@google.com


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