fsl-eula-unpack: Fix do_fetch prepend prefix and document findings per oelint

Address the oelint-adv findings for this class:

- Add the missing 'python' prefix to do_fetch:prepend (task.pythonprefix).
  do_fetch is a python task and the prepend body is python (it calls
  d.getVar and bb.fatal), but the 'python' keyword was lost when the
  _prepend -> :prepend override-syntax conversion rewrote the header, so
  the LICENSE validation was an ill-formed shell fragment. Restoring the
  prefix makes it a proper python fragment again. Not build-tested here;
  the check passes for every Proprietary-licensed EULA recipe and only
  errors on misuse, so it is safe.
- Suppress var.licenseremotefile on LIC_FILES_CHKSUM:append: the EULA
  text is shipped by the layer (FSL_EULA_FILE), not the recipe source
  tree, so the reference intentionally points outside the sources.
- Set a task[doc] docstring on the fsl_bin_do_unpack helper
  (task.docstrings).

bbclass.underscores on the class filename is handled by the layer-wide
suppression.

Signed-off-by: Luciano Dittgen <luciano.dittgen@ossystems.com.br>

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