Add i386/amd64 boot(8) support for keydisk-based softraid crypto volumes.

So far, only passphrase-based crypto volumes were bootable. Full disk
encryption with keydisks required a non-crypto partition to load the kernel.

The bootloader now scans all BIOS-visible disks for RAID partitions and
automatically associates keydisk partitions with their crypto volume.
Attempting to boot from a volume without its keydisk currently results
in a passphrase prompt (this might be changed in the future).

There is no need to re-create existing volumes. Moving the root partition
onto the crypto disk and running installboot(8) is all that's needed.

help & ok jsing

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