staging: unisys: virtpci: Fix CamelCase local variables in virtpci_device_add()

Rename the following local variables in virtpci_device_add()
pIoChan changed to io_chan
pDev changed to dev

Signed-off-by: Bryan Thompson <bryan.thompson@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>