Log UsbConnectorStateChanged events

The following would the logged:
1. Status of the connection - connected/disconnected.
2. Port id as a device could have multiple ports.

Bug: 118783261
Test: Manually tested by running: adb shell cmd stats print-logs,
adb logcat | grep statsd | grep \(70\)
Change-Id: Ideea36c7745293f5b6ec9cc35fd5f709f5175d5a
diff --git a/cmds/statsd/src/atoms.proto b/cmds/statsd/src/atoms.proto
index 41a2021..790a6d1 100644
--- a/cmds/statsd/src/atoms.proto
+++ b/cmds/statsd/src/atoms.proto
@@ -1255,14 +1255,15 @@
  * Logs when something is plugged into or removed from the USB-C connector.
  *
  * Logged from:
- *  Vendor USB HAL.
+ *  UsbService
  */
 message UsbConnectorStateChanged {
     enum State {
-      DISCONNECTED = 0;
-      CONNECTED = 1;
+        STATE_DISCONNECTED = 0;
+        STATE_CONNECTED = 1;
     }
     optional State state = 1;
+    optional string id = 2;
 }
 
 /**