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 263301

In kernel config files, it is supposed to be 'options<space><tab>' not
'options<tab><tab>', per long standing (but recently not so strictly
enforced) convention.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Bring over a configuration for the Atheros AP91 reference board.

This has an AR7240 SoC with an AR9285 wireless NIC on-board.

Since the kernel partition on the 4MiB flash is 960KiB, quite a bit
is disabled to try and squeeze the build into that. Even lzma'ed,
it's still quite large.