Input: usbtouchscreen - constify usbtouch_dev_info table

The data in this table is shared between all instances of the
touchscreens so it should not be modified.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20240712051851.3463657-5-dmitry.torokhov@gmail.com


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