rx: More afspag-specific objects

rx: More afspag-specific objects

For Linux, each object in the kernel module needs to be in only one
module for KBUILD_MODNAME. For AFS_RXERRQ_ENV, we pull in some
additional headers that require KBUILD_MODNAME in rx. So, just add a
few more afspag-specific rx objects.

Change-Id: I80b4a8648141856dffce6e26d5c034dffd8dd5cf
Reviewed-on: http://gerrit.openafs.org/8113
Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: Andrew Deason <adeason@sinenomine.net>