Move vendor-464xlat.rc from external to netd

Since clatd is modularized and shipped in apex,
migrate the clat vendor property to netd.

Bug: 182333299
Bug: 212345928
Test: manual
Change-Id: I73b06547d8443abc749a4ccfe5c7b16b1ed32586
diff --git a/Android.bp b/Android.bp
index 70b525b..47d22a1 100644
--- a/Android.bp
+++ b/Android.bp
@@ -86,10 +86,6 @@
     tidy_flags: [
         "-warnings-as-errors=clang-analyzer-security*,cert-*,android-*",
     ],
-    // Actually not required for clatd itself. See comments in the rc file.
-    init_rc: [
-        "vendor-464xlat.rc",
-    ],
     sanitize: {
         memtag_heap: true,
     },
diff --git a/vendor-464xlat.rc b/vendor-464xlat.rc
deleted file mode 100644
index 609531d..0000000
--- a/vendor-464xlat.rc
+++ /dev/null
@@ -1,15 +0,0 @@
-# Certain vendors disable 464xlat by setting a vendor property.
-# The connectivity code in the Tethering APEX needs to disable
-# 464xlat when the property is set, but it is only allowed to
-# access non-vendor system properties. So copy the property to
-# a property available to system APIs in android.sysprop.
-#
-# Arguably this script should live close to the code that uses
-# it, but scrips in APEXes are not allowed to use "on property".
-# So put it here close to clatd, which is at least related to
-# 464xlat.
-on property:persist.vendor.net.doxlat=true
-    setprop net.464xlat.cellular.enabled true
-
-on property:persist.vendor.net.doxlat=false
-    setprop net.464xlat.cellular.enabled false