475008d6ca
Since rS330365, there has been no particular reason for libofw to be in a subdirectory of ofw. Move libofw up a level to make it fit in better with the other top level libraries. Also add a LIBOFWSRC to stand/defs.mk to match what all the other libraries are doing. Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D23000