Update arguments of stats_write for socket metrics with empty values

The new arguments are needed due to the new fields being added to the BluetoothSocketConnectionStateChanged atom.
These empty values will be replaced with acutal values in a separate change.

Bug: 399022276
Test: m com.google.android.bt
Flag: EXEMPT, metrics logging
Ignore-AOSP-First: workflow for modifying existing atoms
Change-Id: Ie0441325cb6d02ebe0355602e86e9df9eca66c74