Add getCdmaPrlVersion.

Bug:27612001
Change-Id: Ic17375c2c45e32769c9ca9bcefc77d3dce4294f3
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index b3f3be5..9b7132b 100644
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -3209,6 +3209,28 @@
     }
 
     /**
+     * Return the Preferred Roaming List Version.
+     *
+     * @param subId the subscription ID that this request applies to.
+     * @return PRLVersion or null if error.
+     */
+    @Override
+    public String getCdmaPrlVersion(int subId) {
+        enforceReadPrivilegedPermission();
+        Phone phone = getPhone(subId);
+        if (phone == null) {
+            return null;
+        }
+        String cdmaPrlVersion = null;
+        try {
+            cdmaPrlVersion = phone.getCdmaPrlVersion();
+        } catch (Exception e) {
+            Log.e(LOG_TAG, "Not getting PRLVersion", e);
+        }
+        return cdmaPrlVersion;
+    }
+
+    /**
      * Get snapshot of Telephony histograms
      * @return List of Telephony histograms
      * @hide