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With the sepolicy-analyze neverallow checking, attribute
expansion is performed against the device policy and therefore
we do not want our neverallow rules to exempt domains from
consideration based on an attribute (e.g. -unconfineddomain).
Otherwise, device policy could pass the neverallow check just
by adding more domains to unconfineddomain.  We could of course
add a CTS test to check the list of unconfineddomains against
a whitelist, but it seems desirable regardless to narrow these
neverallow rules to only the specific domains required.

There are three such neverallow rules in current policy: one
on creating unlabeled files, one on accessing /dev/hw_random, and
one on accessing a character device without a specific type.  The
only domain in unconfineddomain that appears to have a legitimate
need for any of these permissions is the init domain.  Replace
-unconfineddomain with -init in these neverallow rules, exclude these
permissions from unconfineddoma...