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 r256912, r256931, r256977

Sync BERI kernel configs with P4:

Switch the majority of device configuration to FDT from hints.

Add BERI_*_BASE configs to reduce duplication in the MDROOT and SDROOT
kernels.

Add NFS and GSSAPI support by default.

Enable ATSE_CFI_HACK in BERI configs, stable MAC addresses are useful.

BERI_SIM.hint is no longer used, remove it.

Sponsored by: DARPA/AFRL
Approved by: re (delphij)

Sync BERI kernel configs with P4:

Switch the majority of device configuration to FDT from hints.

Add BERI_*_BASE configs to reduce duplication in the MDROOT and SDROOT
kernels.

Add NFS and GSSAPI support by default.

MFC after: 3 days
Sponsored by: DARPA/AFRL