RESTRICT AUTOMERGE Revert "Move mtectrl to private"

Revert submission 1959735

Reason for revert: b/220807329
Reverted Changes:
Idb5c4a4c6:Move mtectrl to private
I2e8419366:Add policy for command line tool to control MTE bo...

Change-Id: I663113df93fe9fec597ad346a1d07888b068c20e
diff --git a/public/mtectrl.te b/public/mtectrl.te
new file mode 100644
index 0000000..2fb8a96
--- /dev/null
+++ b/public/mtectrl.te
@@ -0,0 +1 @@
+type mtectrl, domain, coredomain;