Implement out-of-band metadata images.

This saves a lot of HIDL bandwidth, by not including raw image data in
metadata vector.

Bug: b/63702941
Test: VTS
Change-Id: I73d5218095e4af34c58da8dcfc520abd4cb46c26
diff --git a/broadcastradio/1.1/default/BroadcastRadio.h b/broadcastradio/1.1/default/BroadcastRadio.h
index d98afa7..71e3be8 100644
--- a/broadcastradio/1.1/default/BroadcastRadio.h
+++ b/broadcastradio/1.1/default/BroadcastRadio.h
@@ -63,6 +63,7 @@
     Return<void> openTuner(const V1_0::BandConfig& config, bool audio,
                            const sp<V1_0::ITunerCallback>& callback,
                            openTuner_cb _hidl_cb) override;
+    Return<void> getImage(int32_t id, getImage_cb _hidl_cb);
 
    private:
     std::mutex mMut;