Include vfio module when CONFIG_KVM_VFIO is set

Based on patch by Jonas Pfoh: Include vfio.o in case the host kernel is recent
enough, thus set CONFIG_KVM_VFIO, to support this feature.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
updated gitmodules to point to nitro-ng_kmod
updated readme
updated readme
updated readme
updated readme
updated gitignore
updated readme
sync updated to include nitro header
updated Makefile to squash "No names found, cannot describe anything."
added nitro_main.o to Kbuild
updated gitignore
added load script
updated submodule reference
set submodule to point to branch
added nitro objects to Kbuild
updated ignore and modules
updated gitmodules to point to nitro-ng_kmod
updated readme
updated gitignore