usb4bsd/if_mos: Make mos(4) compile.
usb4bsd/if_mos: Sync with FreeBSD.
Update devd(8)'s usb.conf for mos(4).
drm/i915: Make the GEM code more Linux-like

* Reduce differences with Linux 3.8.13

* Segregate memory domains in the GTT using coloring

* Enable the use of i915 semaphores