adapt PSB so it can be unittested properly

unittests/mocks/AcceptsTmMock.cpp

@@ -0,0 +1,7 @@
+#include "AcceptsTmMock.h"
+
+AcceptsTmMock::AcceptsTmMock(MessageQueueId_t queueToReturn) : returnedQueue(queueToReturn) {}
+
+MessageQueueId_t AcceptsTmMock::getReportReceptionQueue(uint8_t virtualChannel) {
+  return returnedQueue;
+}