greybus: manifest cport descriptor parsing

Add support for parsing one or more cports descriptors in a module
manifest.  There must be at least one for each interface, but we impose
no limit on the number of interfaces associated with a module.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
greybus: kill off old manifest code

Now that the new manifest code is in place, delete the old stuff
from "core.c".

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>