staging: gpib: fix pcmcia dependencies

With CONFIG_PCMCIA=m, the gpib drivers that optionally support PCMCIA
cannot be built-in.

Add a Kconfig dependency to force these to be loadable modules as
well, and change the GPIB_PCMCIA symbol to have the correct state
for that.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20241213064959.1045243-1-arnd@kernel.org


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