[IMPR] AudioProductStrategy: add getName system hidden API

As volume group, being able to retrieve strategy name helps
clients (e.g. CarAudioService) to refer strategies by name.

Bug: 260298113
Test: build

Change-Id: I8c01f31d715c754f1449b75fa7c754fe61b04d4a
Signed-off-by: François Gaffie <francois.gaffie@renault.com>

core/api/system-current.txt

@@ -7125,6 +7125,7 @@ package android.media.audiopolicy {
     method public int describeContents();
     method @NonNull public android.media.AudioAttributes getAudioAttributes();
     method public int getId();
+    method @NonNull public String getName();
     method public boolean supportsAudioAttributes(@NonNull android.media.AudioAttributes);
     method public void writeToParcel(@NonNull android.os.Parcel, int);
     field @NonNull public static final android.os.Parcelable.Creator<android.media.audiopolicy.AudioProductStrategy> CREATOR;

media/java/android/media/audiopolicy/AudioProductStrategy.java

@@ -231,6 +231,16 @@ public final class AudioProductStrategy implements Parcelable {
         return mId;
     }
 
+    /**
+     * @hide
+     * @return the product strategy ID (which is the generalisation of Car Audio Usage / legacy
+     *         routing_strategy linked to {@link AudioAttributes#getUsage()}).
+     */
+    @SystemApi
+    @NonNull public String getName() {
+        return mName;
+    }
+
     /**
      * @hide
      * @return first {@link AudioAttributes} associated to this product strategy.