Multiple SD card reads per second

[julianoes]

Describe the bug
When debugging read() without SD card I realized that on NuttX we are doing reads from the SD card multiple times a second. Presumably this should be done only when needed, e.g. when the mission is updated or a param is set.

[julianoes]

This seems to come from geofence checks which would make sense, however, I don't think I have a geofence loaded.

[BazookaJoe1900]

@julianoes - I might be wrong, but aren't the parameters stored on the flash, not the SD? so it should be related?

[julianoes]

@BazookaJoe1900 I think you're right about the parameters.

[stale]

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