mpm: Fix documentation and minor issues in sys_utils.GPIOBank

- GPIOBank made the assumption that all bits used where contiguous. This amends
  the documentation to make that more clear, and adds an assert
  statement to check for that.
- reset_all() would reset all pins, regardless of DDR value, rendering
  it useless for any GPIO bank that would want to have readable pins.
  Fixed that by checking DDR value before resetting.
- Minor amendments to various docstrings; improve PyLint score by
  removing superfluous inheritance from object.

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