[Settings] Initial config UI support for cross sim calling

This is the initial configuration UI support for cross SIM calling.

Mock UI: https://docs.google.com/presentation/d/1u9eO9Fs2_kr1mqkzyVe-_iNldM6OBv4ucmhUTr3Z-0w/edit?resourcekey=0-siV3RVBkI_fjH8mMWHbtHg#slide=id.gb4a3581a82_0_0
Screenshot: https://screenshot.googleplex.com/3QX3Y6vAhBYv7LC

Bug: 174012397
Test: manual
Change-Id: Id96b72054bee9b3359e5336cc90acbff7e6d78ea

src/com/android/settings/network/telephony/TelephonyTogglePreferenceController.java

@@ -17,6 +17,7 @@
 package com.android.settings.network.telephony;
 
 import android.content.Context;
+import android.content.res.Resources;
 import android.os.PersistableBundle;
 import android.telephony.CarrierConfigManager;
 import android.telephony.SubscriptionManager;
@@ -79,4 +80,13 @@ public abstract class TelephonyTogglePreferenceController extends TogglePreferen
                 mContext.getSystemService(CarrierConfigManager.class);
         return carrierConfigMgr.getConfigForSubId(subId);
     }
+
+    /**
+     * Returns the resources associated with Subscription.
+     *
+     * @return Resources associated with Subscription.
+     */
+    public Resources getResourcesForSubId() {
+        return SubscriptionManager.getResourcesForSubId(mContext, mSubId);
+    }
 }