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/VirtualProgram.h b/broadcastradio/1.1/default/VirtualProgram.h
index a4fd72c..2ee21a7 100644
--- a/broadcastradio/1.1/default/VirtualProgram.h
+++ b/broadcastradio/1.1/default/VirtualProgram.h
@@ -25,6 +25,9 @@
 namespace V1_1 {
 namespace implementation {
 
+// TODO (b/36864090): inject this data in a more elegant way
+void setCompatibilityLevel(int halversion);
+
 struct VirtualProgram {
     ProgramSelector selector;