Fix getActiveSubscriptionInfoForIccId iccId comparison

The function compared references instead of strings.

Introduced by:

commit c22e8507402956a747469208bd1aa43dbd683e21
Author: Svet Ganov <svetoslavganov@google.com>
Date: Wed Apr 22 13:09:14 2015 -0700

Change-Id: Ib5bb464f708ff548588c2af30e14ea559cf45333
diff --git a/src/java/com/android/internal/telephony/SubscriptionController.java b/src/java/com/android/internal/telephony/SubscriptionController.java
index 351783b..0f8c96c 100644
--- a/src/java/com/android/internal/telephony/SubscriptionController.java
+++ b/src/java/com/android/internal/telephony/SubscriptionController.java
@@ -430,7 +430,8 @@
      */
     @Override
     public SubscriptionInfo getActiveSubscriptionInfoForIccId(String iccId, String callingPackage) {
-        if (!canReadPhoneState(callingPackage, "getActiveSubscriptionInfoForIccId")) {
+        if (!canReadPhoneState(callingPackage, "getActiveSubscriptionInfoForIccId") ||
+                iccId == null) {
             return null;
         }
 
@@ -441,7 +442,7 @@
                     mContext.getOpPackageName());
             if (subList != null) {
                 for (SubscriptionInfo si : subList) {
-                    if (si.getIccId() == iccId) {
+                    if (iccId.equals(si.getIccId())) {
                         if (DBG)
                             logd("[getActiveSubInfoUsingIccId]+ iccId=" + iccId + " subInfo=" + si);
                         return si;