Allow heapprofd to read system_file_type.

Heapprofd needs to read binary files and library in order to support
unwinding the stack. sytem_file does not include all thes files, e.g.
zygote_exec is only labeled as system_file_type.

Denials:

12-03 10:50:37.485  9263  9263 I heapprofd: type=1400 audit(0.0:177): avc: denied { read } for name="app_process64" dev="dm-0" ino=2286 scontext=u:r:heapprofd:s0 tcontext=u:object_r:zygote_exec:s0 tclass=file permissive=1
12-03 10:50:37.485  9263  9263 I heapprofd: type=1400 audit(0.0:178): avc: denied { open } for path="/system/bin/app_process64" dev="dm-0" ino=2286 scontext=u:r:heapprofd:s0 tcontext=u:object_r:zygote_exec:s0 tclass=file permissive=1
12-03 10:50:37.485  9263  9263 I heapprofd: type=1400 audit(0.0:179): avc: denied { getattr } for path="/system/bin/app_process64" dev="dm-0" ino=2286 scontext=u:r:heapprofd:s0 tcontext=u:object_r:zygote_exec:s0 tclass=file permissive=1

Change-Id: Ie04b722a78ff6367729930ee0ef96f48ccf6aa55
Bug: 117762471

private/heapprofd.te

@@ -13,10 +13,10 @@ userdebug_or_eng(`
 
   # Executables and libraries.
   # These are needed to read the ELF binary data needed for unwinding.
-  allow heapprofd system_file:file r_file_perms;
-  allow heapprofd apk_data_file:file r_file_perms;
-  allow heapprofd dalvikcache_data_file:file r_file_perms;
-  allow heapprofd vendor_file_type:file r_file_perms;
+  r_dir_file(heapprofd, system_file_type)
+  r_dir_file(heapprofd, apk_data_file)
+  r_dir_file(heapprofd, dalvikcache_data_file)
+  r_dir_file(heapprofd, vendor_file_type)
 ')
 
 # Write trace data to the Perfetto traced damon. This requires connecting to its