Never done it but since Infinispan is probably quite tightly server-integrated, I would probably edit it into the module of org.infinispan. Version matching is always a good thing if applicable. Perhaps the CDI module is considered "experimental" still if it's not in the main distribution. Start it up, see what breaks and work from there ;-)
The CDI module currently does not ship with AS7, although there is a JIRA open to include it: https://issues.jboss.org/browse/AS7-6658
I tried the CDI module out on a project by including it in my deployment. I didn't find it especially helpful though. Caches/containers can already be injected wherever you need using @Resource, and I didn't find the JCache interceptors useful.