Second set of IIO fixes for the 5.4 cycle.

* adis16480
  - Prevent negative numbers being accepted for sampling frequency.
* inv_mpu6050
  - Fix an issue where fifo overflow bits don't actually work as expected,
    by checking the fifo count instead.
* srf04
  - Allow more time for echo to signal as some sensors supported have
    a higher range.
* stm32-adc
  - Fix a potential race in dma disable by ensuring all transfers are done.
-----BEGIN PGP SIGNATURE-----
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=ikZd
-----END PGP SIGNATURE-----