if the GPIOHANDLE_REQUEST_OUTPUT is set in flags, this specifies the default output value, should be 0 (low) or 1 (high), anything else than 0 or 1 will be interpreted as 1 (high)
updated flags for the requested GPIO lines, such as GPIOHANDLE_REQUEST_OUTPUT, GPIOHANDLE_REQUEST_ACTIVE_LOW etc, OR:ed together
must be 0
Configuration for a GPIO handle request Note: only in kernel newer than early 2020