staging: gpib: Removing typedef for gpib_board

Removing typedef as per Linux code style.

Adhering to Linux code style.

In general, a pointer, or a struct that has elements that can reasonably be
directly accessed should never be a typedef.

Signed-off-by: Michael Rubin <matchstick@neverthere.org>
Acked-By: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20250319215924.19387-21-matchstick@neverthere.org


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