Stop building BERI_DE4_BASE and BERI_SIM_BASE, they aren't particularly
valid as they don't have a root dev. Do build BERI_DE4_SDROOT which
does so devices get coverage.
Remove ident from BERI_DE4_BASE for the reasons above which will cause
it to fail to build. BERI_SIM_BASE was already this way and broke
universe.[0]
Reported by: rpokala
Sponsored by: DARPA, AFRL
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