staging: gpib: use ioport_map

The tnt4882 backend has a rather elabolate way of abstracting the
PIO and MMIO based hardware variants, duplicating the functionality
of ioport_map() in a less portable way.

Change it to use ioport_map() with ioread8()/iowrite8() to do
this more easily.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20241213064959.1045243-2-arnd@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>