staging: gpib: Add GPIB common core driver

This is the common core driver that interfaces with the userland code
and creates the gpib device files.

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20240918121908.19366-6-dpenkler@gmail.com


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