storaged.te: Remove redundant permission.

All SELinux domains are already granted the ability to read the
filenames in /proc, so it's unnecessary to add it to storaged.te.

  $ grep "proc:dir r_dir_perms" public/domain.te
  allow domain proc:dir r_dir_perms;

Remove redundant rule.

Test: policy compiles.
Change-Id: I8779cda19176f7eb914778f131bb5b14e5b14448

private/storaged.te

@@ -8,7 +8,6 @@ init_daemon_domain(storaged)
 allow storaged kmsg_device:chr_file { write append };
 
 # Read access to pseudo filesystems
-allow storaged proc:dir r_dir_perms;
 r_dir_file(storaged, sysfs_type)
 r_dir_file(storaged, proc_net)
 r_dir_file(storaged, domain)