Early boot, activation, upgrades

[Mitch Bradley]

More  benchmarks for bios_crypto on LX:

Whirlpool:  1.16 sec / MiB
SHA512:   0.42 sec / MiB
SHA256:   0.28 sec / MiB  <<------- New result (SHA256 is 1.5x the speed 
of SHA512)
RSA verification: 0.025 sec / hash
ECC521 verification: 1.13 sec / hash
ECC256 verification: 0.31 sec / hash  <<------- New result (ECC256 is 
3.5x the speed of ECC521)

It wasn't obvious how to coerce the code to do 256-bit truncated 
Whirlpool, so I don't have a number for that.