cgroupfs doesn't allow files to be created, so this can't be needed.

Also remove redundant neverallow and dontaudit rules. These are now
more broadly handled by domain.te.

Bug: 74182216

Test: Denials remain silenced.

Change-Id: If7eb0e59f567695d987272a2fd36dbc251516e9f

(cherry picked from commit 8e8c1093)