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)