This code is flyable, but a few problems exist which cause values in the .config files to be overwritten by the defaults in the .XML file.

Original description:
Modified the sensor module to prevent the selection of an invalid
secondary/tertiary gyro if the primary gyro times out

Not sure why they got removed in the first place in the merge.
I also don't know how they are used and what they are for, comments
welcome.

There is no such thing as set_param_no_autosave on QURT, therefore just
save it anyway. On the Snapdragon the overhead should not be a problem.

Otherwise SITL doesn't work anymore, at least on Linux