Feature flag for Ethernet Settings

Flag: com.android.settings.connectivity.ethernet_settings

Adding an aconfig flag for Ethernet Settings CUJs as defined in
go/al-ethernet-prd

Bug: b/384375770
Change-Id: I028e4ac1038416b720fa8872301f50c65f1d4a5f
diff --git a/Android.bp b/Android.bp
index 907ff12..1acd840 100644
--- a/Android.bp
+++ b/Android.bp
@@ -112,6 +112,7 @@
         "setupdesign-lottie-loading-layout",
         "device_policy_aconfig_flags_lib",
         "keyboard_flags_lib",
+        "settings_connectivity_flags",
     ],
 
     plugins: [