IIO staging cleanup

Mentors: [http://kernelnewbies.org/OctavianPurdila Octavian Purdila], [http://kernelnewbies.org/DanielBaluta Daniel Baluta]

checkpatch.pl cleanups

Use scripts/checkpatch.pl to align code in staging/drivers/iio to Linux kernel coding style.

• accel/
  • status: not assigned
• adc/
  • status: not assigned
• addac/
  • status: not assigned
• cdc/

  • status: clean

• frequency/
  • status: not assigned
• gyro/

  • status: clean

• impedance-analyzer/

  • status: clean

• light/
  • status: not assigned
• magnetometer/
  • status: not assigned
• meter/
  • status: not assigned
• resolver/

  • status: clean

• trigger/
  • status: not assigned

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