Fix the testcase failed

Add mock for SubscriptionManager.createForAllUserProfiles

Bug: 323652989
Test: atest MobileNetworkPreferenceControllerTest
Change-Id: I96574a79eba581db95d387f0d9c9fde2e004c41c
diff --git a/tests/unit/src/com/android/settings/network/MobileNetworkPreferenceControllerTest.java b/tests/unit/src/com/android/settings/network/MobileNetworkPreferenceControllerTest.java
index be3815d..1231c01 100644
--- a/tests/unit/src/com/android/settings/network/MobileNetworkPreferenceControllerTest.java
+++ b/tests/unit/src/com/android/settings/network/MobileNetworkPreferenceControllerTest.java
@@ -78,6 +78,7 @@
         mContext = spy(ApplicationProvider.getApplicationContext());
         when(mContext.getSystemService(Context.TELEPHONY_SERVICE)).thenReturn(mTelephonyManager);
         when(mContext.getSystemService(SubscriptionManager.class)).thenReturn(mSubscriptionManager);
+        when(mSubscriptionManager.createForAllUserProfiles()).thenReturn(mSubscriptionManager);
         when(mContext.getSystemService(UserManager.class)).thenReturn(mUserManager);
         if (Looper.myLooper() == null) {
             Looper.prepare();