fix(cros-kernel2.eclass): Fix cpio update steps.

The kernel is much more particular about how it handles the cpio format
than GNU's cpio tool. Two things:
 - Don't use the -depth option to find, cpio documentation recommends
   using it (the directory comes after the contents so set the
   permissions on the dir last in case it is overly restrictive) but the
   kernel thinks the other direction and doesn't put things into a
   directory that does not (yet) exist.
 - Don't add anything under /lib which is a symlink in the original
   file. Adding /lib as a directory later replaces the earlier /lib
   symlink. Again the user space tool thinks in the other direction and
   will happily dereference the symlink while extracting, preserving it.

CPIO CPIO CPIO!
fix(sys-kernel/coreos-kernel): Update modular config, more modules!

Switch more things to modules previously missed (such as SCSI). Clean up
more debug options.
Merge pull request #256 from marineam/modules

Modules