[COMPLETED] 15.1.11-amd64 driver backports from 10-STABLE

[franco]

-CURRENT is cutting edge
-STABLE is forked from -CURRENT for major releases (e.g. 10)
-RELEASE is forked from -STABLE for minor releases (e.g. 10.1)

The work on -RELEASE is also called RELENG, short for release engineering, because -RELEASE branches are closed for most committers. At some point versions were tagged as RELENG_10_1, as e.g. pfSense still does it today.