Allow installd to restorecon /data/data.

Ability to relabel from/to any of the types that can be assigned
to /data/data directories as per seapp_contexts type= assignments.

Change-Id: I70b0feacb2e8ee8f2b18b7c166402d5128e68456
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>