Moved getId API from system to public

Fix: 169641293
Test: Build
Change-Id: I5e766c8d30bbaf9010bc4a1bc621b0db6f988cc8

core/api/current.txt

@@ -40487,6 +40487,7 @@ package android.telephony {
   public final class PreciseDataConnectionState implements android.os.Parcelable {
     method public int describeContents();
     method @Nullable public android.telephony.data.ApnSetting getApnSetting();
+    method public int getId();
     method public int getLastCauseCode();
     method @Nullable public android.net.LinkProperties getLinkProperties();
     method public int getNetworkType();

core/api/system-current.txt

@@ -9758,7 +9758,6 @@ package android.telephony {
     method @Deprecated public int getDataConnectionApnTypeBitMask();
     method @Deprecated public int getDataConnectionFailCause();
     method @Deprecated public int getDataConnectionState();
-    method public int getId();
   }
   public final class PreciseDisconnectCause {

telephony/java/android/telephony/PreciseDataConnectionState.java

@@ -166,14 +166,12 @@ public final class PreciseDataConnectionState implements Parcelable {
     /**
      * @return The unique id of the data connection
      *
-     * Note this is the id assigned in {@link DataCallResponse}.
+     * Note this is the id assigned by the data service.
      * The id remains the same for data connection handover between
      * {@link AccessNetworkConstants#TRANSPORT_TYPE_WLAN} and
      * {@link AccessNetworkConstants#TRANSPORT_TYPE_WWAN}
      *
-     * @hide
      */
-    @SystemApi
     public int getId() {
         return mId;
     }