Allow heapprofd to read packages.list.

This is so it can check profileability.

Bug: 153139002
Change-Id: I3d3c23f8f8bc564bc1c2b3f7cdeab2d32f084917
diff --git a/private/heapprofd.te b/private/heapprofd.te
index 7e16b9b..5f1476e 100644
--- a/private/heapprofd.te
+++ b/private/heapprofd.te
@@ -53,6 +53,9 @@
   allow heapprofd proc_kpageflags:file r_file_perms;
 ')
 
+# For checking profileability.
+allow heapprofd packages_list_file:file r_file_perms;
+
 # This is going to happen on user but is benign because central heapprofd
 # does not actually need these permission.
 # If the dac_read_search capability check is rejected, the kernel then tries