Document the new nvlist_get_parent() function.

Submitted by:	Mariusz Zaborski
Move the ARM Samsung s3c2xx0 support files into the samsung directory, to
match other platforms.

Discussed with:	andrew
Remove duplicated header content

I fail at patch(1).

MFC after:	3 days
Add basic man page for ipheth(4).

MFC after:	1 week
Cross reference cdce(4), ipheth(4) and urndis(4) from each other.

MFC after:	1 week
add missing file

Submitted by:	Daniel Peyrolon
MFC after:	3 days
Replace multiple nearly-identical copies of code to walk through an FDT
node's interrupts=<...> property creating resource list entries with a
single common implementation.  This change makes ofw_bus_intr_to_rl() the
one true copy of that code and removes the copies of it from other places.

This also adds handling of the interrupts-extended property, which allows
specifying multiple interrupts for a node where each interrupt can have a
separate interrupt-parent.  The bindings for this state that the property
cells contain an xref phandle to the interrupt parent followed by whatever
interrupt info that parent normally expects.  This leads to having a
variable number of icells per interrupt in the property.  For example you
could have <&intc1 1 &intc2 26 9 0 &intc3 9 4>.

Differential Revision: https://reviews.freebsd.org/D803
adapt the code to different freebsd versions.
Not necessary to MFC