Revert "BluetoothSystemServer: add Hidden AutoOn metrics"

This reverts commit ff13bd6d16ed1c4ee5f14a7aa47be04e2f86ae46.

Reason for revert: Related code was revert -- See aosp/3023046

Bug: 323060869
Bug: 316946334
Change-Id: I7a541b6496ba28b1199e6ba3a90cb61d526c0658
Test: atest serviceBluetoothRoboTests
diff --git a/stats/express/catalog/bluetooth.cfg b/stats/express/catalog/bluetooth.cfg
index 1f71c67..0f2ad0b 100644
--- a/stats/express/catalog/bluetooth.cfg
+++ b/stats/express/catalog/bluetooth.cfg
@@ -85,12 +85,3 @@
     owner_email: "wescande@google.com"
     unit: UNIT_COUNT
 }
-
-express_metric {
-    id: "bluetooth.value_auto_on_hidden_usage"
-    type: COUNTER
-    display_name: "Auto on -- usage of pre-V hidden API"
-    description: "How many times the AutoOnFeature is used on device prior to V"
-    owner_email: "wescande@google.com"
-    unit: UNIT_COUNT
-}