Add driver for BERI soft processor 'ring buffer' device.
Ring device provides a way for communicate to BERI
peripherals such as BERI debug unit and console.

Sponsored by:	DARPA, AFRL
Add new quirks for the latest Samsung SSD, model 850.

Submitted by:	sbruno
MFC after:	2 weeks
cxgb(4): reset the PHY if it generates an interrupt for no apparent reason.

MFC after:	1 week
Style changes as pointed out by stas@.

MFC after:	1 week
Fail to probe on simplebus nodes that lack a "ranges" property.

Increasingly, FDT data has the "simple-bus" compatible string on nodes
that have children, but we wouldn't consider them to be busses.  If the
node lacks a ranges property then we will fail to attach successfully,
so fail to probe as well.
Attach this driver during BUS_PASS_BUS and move the cpu init code to a
bus_new_pass() handler so it doesn't happen until BUS_PASS_CPU.  This allows
the anatop driver to outbid the generic simplebus driver (which the FDT
data describes as compatible).

Some day when we handle power regulators, this driver may actually
become a functional simplebus and attach the regulators as children, as
described in the FDT data.
Allow libkvm to get the kernel va to pa delta without the need for
physaddr. This should allow for a kernel where PHYSADDR and KERNPHYSADDR
are both undefined.

For now libkvm will use the old method of reading physaddr and kernaddr
to allow it to work with old kernels. This could be removed in the future
when enough time has passed.

Differential Revision:	https://reviews.freebsd.org/D939
MFC after:	1 week
- Honer MK_KERBEROS for Heimdal rc.d scripts.
- Add rc.c/kerberos to OLD_FILES.
Only build the ARM tranpoline when KERNPHYSADDR is defined as it is
otherwise unneeded in armv6 kernels.

MFC after:	1 week
Allow the armv6 kernel to be build with PHYSADDR undefined. The kernel
will now find the virtual to physical mapping for libkvm to use at
runtime. This makes PHYSADDR redundant, however keep it around to give
everyone a chance to update their libkvm.

MFC after:	1 week