[idd] input: report volume keys as consumer controls

Expose a Consumer Control HID report for the system volume usages that
Windows does not handle through the Keyboard/Keypad usage page.

Translate the existing mute and volume keyboard usages at the LGInput
boundary, preserve normal keyboard state, and force a neutral consumer
report across resets and HID device reactivation.

idd/LGInput/ipc/CInputPipeClient.h

@@ -43,5 +43,5 @@ private:
   bool SubmitReport(const void * report, size_t size);
 
   CPipeEndpoint m_endpoint;
-  uint64_t m_lastSequence = 0;
+  uint64_t      m_lastSequence = 0;
 };