Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

The NetBSD Foundation has granted permission to remove clause 3 and 4 from
their software.

Obtained from: NetBSD

Disable interrupts after doing early takeover of the usb controller in case usb
isnt actually compiled in (or kldloaded) as the controller could cause spurious
interrupts.

Tested by: Florian Smeets

Workaround buggy BIOS code in USB regard. By doing the BIOS to OS handover for
all host controllers at the same time, we avoid problems where the BIOS will
actually write to the USB registers of all the USB host controllers every time
we handover one of them, and consequently reset the OS programmed values.

Submitted by: avg
Reviewed by: jhb