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

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

MFC: r225882

Remove pointless semicolons after label

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

Approved by: re (implicit)

Tweak the disclaimer section of the license to match COPYRIGHT, for
better or worse. Ok'd by folks that have additional copyrights to the
files in cases where there's joint authorship.

Correct return code (int) for at91_rtc_intr() prototype.

Approved by: cognet

o break newbus api: add a new argument of type driver_filter_t to
bus_setup_intr()

o add an int return code to all fast handlers

o retire INTR_FAST/IH_FAST

For more info: http://docs.freebsd.org/cgi/getmsg.cgi?fetch=465712+0+current/freebsd-current

Reviewed by: many
Approved by: re@

Implement the set_time function. Rather pointless with this RTC, as it
resets when the core resets, but there may be some use for it...

Add RTC support. This may be of dubious value since the RTC is reset
to 1998 every reboot.