Add AID for PRNG seeder daemon.

Also adjust permissions on /dev/hw_random to allow prng_seeder group
read access.

Manual testing protocol:
* Verify prng_seeder daemon is running and has the
  correct label and uid/gid.
* Verify prng_seeder socket present and has correct
  label and permissions
* Verify no SELinux denials
* strace a libcrypto process and verify it reads seeding
  data from prng_seeder (e.g. strace bssl rand -hex 1024)
* strace seeder daemon to observe incoming connections
  (e.g. strace -f -p `pgrep prng_seeder`)
* Kill daemon, observe that init restarts it
* strace again and observe clients now seed from new instance

Bug: 243933553
Test: Manual - see above
Change-Id: I4d526844b232fc2a1fa5ffd701ca5bc5c09e7e96
diff --git a/rootdir/ueventd.rc b/rootdir/ueventd.rc
index a140c8c..4ec59af 100644
--- a/rootdir/ueventd.rc
+++ b/rootdir/ueventd.rc
@@ -37,6 +37,8 @@
 /dev/tty                  0666   root       root
 /dev/random               0666   root       root
 /dev/urandom              0666   root       root
+# Aside from kernel threads, only prng_seeder needs access to HW RNG
+/dev/hw_random            0400   prng_seeder prng_seeder
 /dev/ashmem*              0666   root       root
 /dev/binder               0666   root       root
 /dev/hwbinder             0666   root       root