feat: A2DP bluetooth audio working

kernel/src/Drivers/USB/Bluetooth/Avrcp.hpp

@@ -0,0 +1,19 @@
+/*
+    * Avrcp.hpp
+    * Bluetooth AVRCP (Audio/Video Remote Control Profile) -- minimal Target role
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+
+namespace Drivers::USB::Bluetooth::Avrcp {
+
+    // Process an AVCTP packet arriving on an AVRCP control channel (PSM 0x0017).
+    // Implements a minimal AVRCP Target: unit/subunit info, pass-through accept,
+    // GetCapabilities, RegisterNotification (interim), absolute volume.  Runs
+    // from the ACL receive path (DrainEvents, top-level) -- sending is safe
+    // there, blocking waits are not (none are used).
+    void ProcessAvctp(uint16_t localCid, const uint8_t* data, uint16_t len);
+
+}