Firmware compression

[Andrew Doran <ad%netbsd.org@localhost>]

We have a meg or two of firmware images in the i386 GENERIC kernel, which is
insane. I was thinking of adding a function that would use kmem_alloc+zlib
to decompress images, and another to optionally free the decompressed image.
It would probably also be good to add a simple program under dev/microcode
to take a blob and spit out a compressed array in a C file.

Thoughts?

Thanks,
Andrew