Migrate legacy dhcp server config to DeviceConfig

Legacy dhcp server can also be enabled by resource config.

Bug: 144814607
Test: -build, flash, boot
      -atest TetheringTests

Change-Id: I8ae5fa3d5bbd88129bd0890f71be6f8a1bfec0eb
diff --git a/Tethering/AndroidManifest.xml b/Tethering/AndroidManifest.xml
index e99c2c5..5a71eb2 100644
--- a/Tethering/AndroidManifest.xml
+++ b/Tethering/AndroidManifest.xml
@@ -32,6 +32,7 @@
     <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
     <uses-permission android:name="android.permission.MANAGE_USB" />
     <uses-permission android:name="android.permission.MODIFY_PHONE_STATE" />
+    <uses-permission android:name="android.permission.READ_DEVICE_CONFIG" />
     <uses-permission android:name="android.permission.READ_NETWORK_USAGE_HISTORY" />
     <uses-permission android:name="android.permission.TETHER_PRIVILEGED" />
     <uses-permission android:name="android.permission.UPDATE_APP_OPS_STATS" />