Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Split CESA memory resource into TDMA and CESA regs

TDMA and CESA registers are placed in different ranges of memory. Split
memory resource in DTS to reflect that. This change is needed to support
multiple CESA nodes as otherwise the ranges of different nodes would
overlap.

In consequence, CESA_WRITE and CESA_READ macros have been split depending
on which range of registers is accessed. Offsets for CESA registers have
been modified as the base address has changed.

Submitted by: Michal Stanek <mst@semihalf.com>
Obtained from: Semihalf
Sponsored by: Stormshield
Differential revision: https://reviews.freebsd.org/D6217

Integrate device-tree upstream files into the build process:
(1) Invoke cpp to bring in files via #include (although the old
/include/ stuff is supported still).
(2) bring in files from either vendor tree or freebsd-custom files
when building.
(3) move all dts* files from sys/boot/fdt/dts to
sys/boot/fdt/dts/${MACHINE} as appropriate.
(4) encode all the magic to do the build in sys/tools/fdt/make_dtb.sh
so that the different places in the tree use the exact same logic.
(5) switch back to gpl dtc by default. the bsdl one in the tree has
significant issues not easily addressed by those unfamiliar with
the code.

Enable the cesa security/crypto device by providing the required property
in the dts source, and adding the right devices to the kernel config. Also
generally bring the kernel config into line with what we have for other
Marvell/Kirkwood systems (add lots of useful devices and options).

One particularly notable addition amongst the kernel config changes is
USB_HOST_ALIGN=32, which may help eliminate data corruption on USB drives.

PR: kern/181975 arm/162159

Update the dockstar DTS to reflect just NAND flash (no SPI NOR flash, and
the LED specification was just misplaced). The rather odd memory mappings
that were in place used an undocumented attribute value (0x0f) that caused
problems with the system.

Submitted by: Markus Pfeiffer <markus.pfeiffer@morphism.de>

Add custom kernel configuration and device tree source files for
Seagate FreeAgent DockStar(tm) device. It seems to be a dumb down
version of Marvell SheevaPlug. Device tree source file could use
more tweaking, but at least it wll network boot and run FreeBSD/arm.