Revert^3 "sepolicy: rules for uid/pid cgroups v2 hierarchy"

a54bed6907439ff5b9c51268b6ce331088497859

Bug: 151660495
Test: verified proper boot in regular mode and proper working of adb in
recovery

Change-Id: Id70d27a6162af6ede94661005d80a2a780057089
diff --git a/private/system_server.te b/private/system_server.te
index b4f72bd..6767cd1 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -868,7 +868,6 @@
 
 # Clean up old cgroups
 allow system_server cgroup:dir { remove_name rmdir };
-allow system_server cgroup_v2:dir { remove_name rmdir };
 
 # /oem access
 r_dir_file(system_server, oemfs)
@@ -947,8 +946,9 @@
 allow system_server preloads_media_file:dir { r_dir_perms write remove_name rmdir };
 
 r_dir_file(system_server, cgroup)
-r_dir_file(system_server, cgroup_v2)
 allow system_server ion_device:chr_file r_file_perms;
+allow system_server cgroup_v2:dir rw_dir_perms;
+allow system_server cgroup_v2:file rw_file_perms;
 
 # Access to /dev/dma_heap/system
 allow system_server dmabuf_system_heap_device:chr_file r_file_perms;