Add PNP info to PCI attachment of cas driver

Move module delcaration to be after device table. The PNP_INFO must
follow the module declaration.

Reviewed by: imp, chuck
Submitted by: Lakhan Shiva Kamireddy <lakhanshiva@gmail.com>
Sponsored by: Google, Inc. (GSoC 2018)
Pull Request: https://github.com/bsdimp/freebsd/pull/5