2nd set of IIO fixes for 6.1

Another mixed bag of driver fixes.

* atmel,at91-sama5d2
  - Drop a 5 degree offset as not needed for production devices.
  - Missing iio_trigger_free() in error path.
* bosch,bma400
  - Turn power on before trying to read chip ID.
* bosch,bno055
  - Avoid uninitialized variable warning (no actual impact)
* meas,ms5611
  - Fix multiple instances of driver sharing single prom array.
  - Stop forcing SPI speed to max devices supports
* mps,mp2629
  - Wrong structure field used to match channel.
  - Missing NULL terminator.
* sysfs-trigger
  - Fix memory leak in error path.
* tools
  - Fix wrong read size when calling with noevents.
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