IIO: 2nd set of fixes for the 6.8 cycle.

Given this is very late these can wait for the 6.9 cycle if you would
prefer.

adi,adxl367
- Sleep for 15ms after reset to avoid reading before the device is awake.
- Fix FIFO register address.
asc,dlhl60d
- Avoid uninitialized data leak to user-space. Also suppress a false
  positive clang warning by refactoring a loop.
bosch,bmp280
- Fix missing extra byte in SPI reads from BMP38x and BMP390 parts
invensense,mpu6050
- Fix handing of empty FIFO which can happen due to a race condition.
- Make sure frequency can be updated more than once when the FIFO is not
  enabled.
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