Staging: add Driver for Altera PCI Express Chaining DMA reference design

Altera PCI Express Chaining DMA driver

A reference driver that exercises the Chaining DMA logic reference
design generated along the Altera FPGA PCI Express soft or hard core,
only if instantiated using the MegaWizard, not the SOPC builder, of
Quartus 8.1.

This driver can be used to test the logic instantiation and PCI
Express layers and acts as a starting point for driving custom logic
connected to the PCI Express End Point Chaining DMA engines.

Signed-off-by: Leon Woestenberg <leon@sidebranch.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>