staging: dgnc: delete a bunch of PCI board variables

None of these were being used at all, only set and never used again, so
remove them from the code.

Cc: Lidza Louina <lidza.louina@gmail.com>
Cc: Mark Hounschell <markh@compro.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>