Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

MFC r270858, 270879:

Remove duplicated option FDT from individual Wandboard configs, leave
the one in the common IMX6 file that they all include.

Approved by: re(gjb)

MFC 265155, 265254:

Omit from the universe build all config files tagged with #NO_UNIVERSE.

Add FDT to the VYBRID kernel.

MFC 264137: Switch wandboards over to the common IMX6 kernel config, which
has SMP enabled. Also switch IMX6 to use SCHED_ULE.

MFC r257603, r257604:

Rename WANDBOARD-COMMON to WANDBOARD.common and adjust the configs that
include it accordingly. The build machinery for universe and tinderbox
tries to build every kernel config whose name begins and ends with [A-Z0-9]
and the common include file that has most of the options isn't buildable
by itself, so the new lowercase .common will avoid building it.

MFC r257483, r257486, r257489:

Add the Soc- / machine-dependent parts of imx6 support.
Add dts source for imx6 SoCs and for Wandboard boards.
Add kernel config for Wandboard.

Kernel config for Wandboard.