Support reset IMS stack in Reset Mobile Network flow

Reset the IMS stack for the specified subscription
with the help of API TelephonyManager#resetIms.

Bug: 271921464
Test: ResetNetworkOperationBuilderTest
Change-Id: I61575f18bcc300f362000dc7f4257b9d794b6b69

src/com/android/settings/network/ResetNetworkOperationBuilder.java

@@ -33,6 +33,7 @@ import android.telephony.SubscriptionManager;
 import android.telephony.TelephonyManager;
 import android.util.Log;
 
+import com.android.settings.ResetNetworkRequest;
 import com.android.settings.network.apn.ApnSettings;
 
 import java.util.ArrayList;
@@ -212,6 +213,32 @@ public class ResetNetworkOperationBuilder {
         return this;
     }
 
+    /**
+     * Append a step of resetting IMS stack.
+     *
+     * @return this
+     */
+    public ResetNetworkOperationBuilder resetIms(int subId) {
+        attachSystemServiceWork(Context.TELEPHONY_SERVICE,
+                (Consumer<TelephonyManager>) tm -> {
+                    if (subId == ResetNetworkRequest.INVALID_SUBSCRIPTION_ID) {
+                        // Do nothing
+                        return;
+                    }
+                    if (subId == ResetNetworkRequest.ALL_SUBSCRIPTION_ID) {
+                        // Reset IMS for all slots
+                        for (int slotIndex = 0; slotIndex < tm.getActiveModemCount(); slotIndex++) {
+                            tm.resetIms(slotIndex);
+                        }
+                    } else {
+                        // Reset IMS for the slot specified by the sucriptionId.
+                        final int slotIndex = SubscriptionManager.getSlotIndex(subId);
+                        tm.resetIms(slotIndex);
+                    }
+                });
+        return this;
+    }
+
     /**
      * Construct a Runnable containing all operations appended.
      * @return Runnable