Removed a duplicate rule.

Test: Device boots
Change-Id: I151c5fb6f56850eaa215e1a917ac9ad609dbdd4a

public/vold.te

@@ -47,7 +47,6 @@ allow vold media_rw_data_file:file create_file_perms;
 
 # Allow mounting of storage devices
 allow vold { mnt_media_rw_stub_file storage_stub_file }:dir { mounton create rmdir getattr setattr };
-allow vold sdcard_type:filesystem { mount unmount remount };
 
 # Manage per-user primary symlinks
 allow vold mnt_user_file:dir create_dir_perms;