staging: gpib: cb7210: select NEC7210 library

staging: gpib: cb7210: select NEC7210 library

The nec7210 library module is required to build cb7210:

ERROR: modpost: "nec7210_write" [drivers/staging/gpib/cb7210/cb7210.ko] undefined!
ERROR: modpost: "nec7210_read" [drivers/staging/gpib/cb7210/cb7210.ko] undefined!
ERROR: modpost: "nec7210_command" [drivers/staging/gpib/cb7210/cb7210.ko] undefined!
ERROR: modpost: "nec7210_take_control" [drivers/staging/gpib/cb7210/cb7210.ko] undefined!

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20241016111521.1143191-8-arnd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>