A2D_SetTraceLevel() function

* Function A2D_SetTraceLevel * Description Sets the trace level for A2D. If 0xff is passed, the * current trace level is returned. * Input Parameters: * new_level: The level to set the A2D tracing to: * 0xff-returns the current setting. * 0-turns off tracing. * >= 1-Errors. * >= 2-Warnings. * >= 3-APIs. * >= 4-Events. * >= 5-Debug. * Returns The new trace level or current trace level if * the input parameter is 0xff.