feat: Intel BT firmware download, A2dp & Bluetooth audio progress

kernel/src/Drivers/USB/Xhci.hpp

@@ -315,6 +315,16 @@ namespace Drivers::USB::Xhci {
     // Queue an interrupt IN transfer on a device's interrupt endpoint
     void QueueInterruptTransfer(uint8_t slotId);
 
+    // Clear a halted interrupt IN endpoint (Reset Endpoint + Set TR Dequeue)
+    // and re-arm reception.  Needed after a USB transaction error on the event
+    // pipe (e.g. during Bluetooth firmware download).
+    void ResetInterruptEndpoint(uint8_t slotId);
+
+    // True while PollEvents() is draining the event ring.  A command submitter
+    // reached from inside an event callback must fire-and-forget (not wait),
+    // since a nested PollEvents() is a no-op.
+    bool InPollContext();
+
     // Queue a bulk transfer on a device's bulk IN or OUT endpoint
     void QueueBulkInTransfer(uint8_t slotId, uint8_t* data, uint64_t dataPhys, uint32_t length);
     void QueueBulkOutTransfer(uint8_t slotId, uint8_t* data, uint64_t dataPhys, uint32_t length);