Remove references to the MAVLinkChannel.{h,cpp} files that I still have locally

src/comm/LinkInterface.cc

@@ -37,7 +37,7 @@ LinkInterface::~LinkInterface()
 uint8_t LinkInterface::mavlinkChannel(void) const
 {
     if (!mavlinkChannelIsSet()) {
-        qCWarning(LinkInterfaceLog) << "Call to MAVLinkChannel::id with isSet() == false";
+        qCWarning(LinkInterfaceLog) << "mavlinkChannel isSet() == false";
     }
     return _mavlinkChannel;
 }

src/comm/LinkInterface.h

@@ -24,7 +24,6 @@
 #include "QGCMAVLink.h"
 #include "LinkConfiguration.h"
 #include "MavlinkMessagesTimer.h"
-#include "MAVLinkChannel.h"
 
 class LinkManager;