First set of IIO fixes in the 5.3 cycle.

* cros_ec_accel_legacy
  - Fix a false double entry for channel scale as both per channel
    and shared.
* gyro_adc
  - Fix uninitialized return code that got detected by GCC 9.0 having
    be previously missed.
* ingenic_adc
  - Set the clock divider on probe to avoid an issue seen with false
    button press detections on JZ4725B SoCs.
* max9611
  - Backwards parameters in GENMASK.
* mpu6050
  - Enforce the fact only certain scan modes are actually possible.

One counter fix also picked up for William,

* generic-counter.rst
  - Fix some references.
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