Stop setting net.hostname

Test: as follows
    - basics:
        - built
        - flashed
        - booted
    - connect to {v4-only, dualstack, v6-only} networks
        - verified expected connectivity on each
    - runtest frameworks-net
Bug: 30979015

Change-Id: I65e9878c7b8eaddaba1c0e1b8566ddfa0760047f
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 8108c4c..41eaa6a 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -720,16 +720,6 @@
         mHandler = new InternalHandler(mHandlerThread.getLooper());
         mTrackerHandler = new NetworkStateTrackerHandler(mHandlerThread.getLooper());
 
-        // setup our unique device name
-        if (TextUtils.isEmpty(SystemProperties.get("net.hostname"))) {
-            String id = Settings.Secure.getString(context.getContentResolver(),
-                    Settings.Secure.ANDROID_ID);
-            if (id != null && id.length() > 0) {
-                String name = new String("android-").concat(id);
-                SystemProperties.set("net.hostname", name);
-            }
-        }
-
         mReleasePendingIntentDelayMs = Settings.Secure.getInt(context.getContentResolver(),
                 Settings.Secure.CONNECTIVITY_RELEASE_PENDING_INTENT_DELAY_MS, 5_000);