Add logging message to indicate collision with previous pending connection...

Add logging message to indicate collision with previous pending connection from the same remote device.

Currently, When there's already a pending connecting procedure going on in the native layer (even if it were the same remote device), the native layer returns BT_STATUS_BUSY which is then interpreted by the JNI layer as a failure to connect, resulting in a disconnection request.

This adds logging message when this happens, until there's a clear
indication to prioritize a complete fix.

Tag: #stability
Bug: 174127136
Test: manual through repeated connections in ADT3 OOBE
Change-Id: Ifc84e883f8ae248ecfa99556465c22b32ce82f79