Avoid showing emergency calls when not possible

Tablets aren't phones, so we shouldn't be showing an emergency calls
only message when in airplane mode or no sims are in them.

Bug: 18897573
Change-Id: I8cf31fe73dfd6dfd672a5ee58524815475a76c9c

packages/SystemUI/src/com/android/systemui/qs/tiles/CellularTile.java

@@ -184,6 +184,11 @@ public class CellularTile extends QSTile<QSTile.SignalState> {
                 // Make sure signal gets cleared out when no sims.
                 mInfo.mobileSignalIconId = 0;
                 mInfo.dataTypeIconId = 0;
+                // Show a No SIMs description to avoid emergency calls message.
+                mInfo.enabled = true;
+                mInfo.enabledDesc = mContext.getString(
+                        R.string.keyguard_missing_sim_message_short);
+                mInfo.signalContentDescription = mInfo.enabledDesc;
             }
             refreshState(mInfo);
         }

packages/SystemUI/src/com/android/systemui/statusbar/policy/NetworkControllerImpl.java

@@ -1192,7 +1192,7 @@ public class NetworkControllerImpl extends BroadcastReceiver
                 int length = mSignalsChangedCallbacks.size();
                 for (int i = 0; i < length; i++) {
                     mSignalsChangedCallbacks.get(i).onMobileDataSignalChanged(mCurrentState.enabled
-                            && !mCurrentState.isEmergency && !mCurrentState.airplaneMode,
+                            && !mCurrentState.isEmergency,
                             getQsCurrentIconId(), contentDescription,
                             qsTypeIcon,
                             mCurrentState.dataConnected && mCurrentState.activityIn,