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

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