QEmu support for MSI capable devices

[Deniz-Eren]

[Deniz-Eren]

QEmu support for MSI and MSI-X capable devices are being drafted up in cloned repository branch feature/can-sja100-pci-msi-support.

[Deniz-Eren]

Split MSI-X support in the QEmu fork branch, from pcm26d2ca to create a template device named demo0x11. This was done because MSI-X is not supported by the actual device and we do not want to lose the MSI-X implementation work done.

Therefore, pcm26d2ca is ready to be contributed to the QEmu project and the demo0x11 can remain as a template for future use.