GATT_SetTraceLevel() function

* Function GATT_SetTraceLevel * Description This function sets the trace level. If called with * a value of 0xFF, it simply returns the current trace level. * Input Parameters: * level: The level to set the GATT tracing to: * 0xff-returns the current setting. * 0-turns off tracing. * >= 1-Errors. * >= 2-Warnings. * >= 3-APIs. * >= 4-Events. * >= 5-Debug. * Returns The new or current trace level