Kernel prepatch 4.14-rc8

The 4.14-rc8 kernel prepatch is out fortesting. "But to actually have decided that we don't need an rc8 this release,it would have had to be really totally quiet, and it wasn't. Nothinglooks scary, but we did have a few reverts in here still, and I'lljust feel happier giving 4.14 another final week... and I really hope that _will_ be the final week, and we don't findanything new scary." Along with the various fixes, this prepatchalso adds SPDX license tags to a lot of kernel source files.