Input: rohm_bu21023 - factor out settings update code

The code to toggle axis swapping and inversion is repetitive and can
be factored out.

Link: https://lore.kernel.org/r/20240609235134.614592-1-dmitry.torokhov@gmail.com


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