Add common ivshmem driver, provide the ivshmem bus mechisam, so many ivshmem based driver can change to pci_ivshmem based Signed-off-by: Bowen Wang <wangbowen6@xiaomi.com>
Application can open "/dev/uioX" and use `mmap()` to get the memory provided by ivshmem device. Signed-off-by: Bowen Wang <wangbowen6@xiaomi.com>