Added a basic README to the project.

Updated host/linvnet.c per the changes to net_device->destructor.

See also:

  - https://github.com/torvalds/linux/commit/cf124db566e6b036b8bcbe8decbed740bdfac8c6

Updated host/linvcons.c to use new timer API introduced in Linux 4.14.0.

See also:

  - https://lwn.net/Articles/735887/

  - https://stackoverflow.com/questions/53839625

A few cosmetic changes found while making the previous commit.

Replaced deprecated pci_enable_msix() call with equivalent pci_enable_msix_exact() call.

See also:

  - https://patchwork.kernel.org/project/linux-pci/patch/1412955343-27239-1-git-send-email-agordeev@redhat.com/

  - http://tomoyo.osdn.jp/cgi-bin/lxr/source/Documentation/PCI/MSI-HOWTO.txt?v=linux-4.7.10

Manually building a 'clean' target in the Makefile.
After completing the port to the newer kernel, the pattern behind this cleanup
can be better organized.

Manually specified target architecture in Makefile.

Initial commit of files contained in `mpss-modules-3.8.6.tar.bz2` for Intel Xeon Phi.