Add a condition for preventing NPE when accessing SatelliteManager

There could be a case that FEATURE_TELEPHONY_SATELLITE is false but KEY_SATELLITE_ATTACH_SUPPORTED_BOOL it true
Since SatelliteManager can be returned only when FEATURE_TELEPHONY_SATELLITE is enabled, added a condition checks whether SatelliteManager is null or not

Bug: 347057183
Test: atest SatelliteManagerTest SatelliteManagerTestOnMockServiceTest
      manually e2e test with FEATURE_TELEPHONY_SATELLITE disabled
Change-Id: I3f51e6805ccab3366d9d01be2e999818cd18354f

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

@@ -64,6 +64,10 @@ public class SatelliteSettingPreferenceController extends
             return UNSUPPORTED_ON_DEVICE;
         }
 
+        if (mSatelliteManager == null) {
+            return UNSUPPORTED_ON_DEVICE;
+        }
+
         final PersistableBundle carrierConfig = mCarrierConfigCache.getConfigForSubId(subId);
         final boolean isSatelliteAttachSupported = carrierConfig.getBoolean(
                 CarrierConfigManager.KEY_SATELLITE_ATTACH_SUPPORTED_BOOL);