Usb changes and strings for connected devices 2.0

New metrics constant and usb strings for the new
notification / details page.

Bug: 69333961
Test: Check notification
Change-Id: If9bde7f787e40e42bb991a99b032e1ff968a0a41
diff --git a/proto/src/system_messages.proto b/proto/src/system_messages.proto
index db70184..08fdb97 100644
--- a/proto/src/system_messages.proto
+++ b/proto/src/system_messages.proto
@@ -200,6 +200,10 @@
     // Package: android
     NOTE_CARRIER_NETWORK_AVAILABLE = 46;
 
+    // Inform that USB is configured for Tethering
+    // Package: android
+    NOTE_USB_TETHER = 47;
+
     // ADD_NEW_IDS_ABOVE_THIS_LINE
     // Legacy IDs with arbitrary values appear below
     // Legacy IDs existed as stable non-conflicting constants prior to the O release