Fix PCI kernel-doc warning:

Warning(linux-2.6.29-rc4-git1/drivers/pci/rom.c:67): No description found for parameter 'pdev'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>