recipes: Document the remaining custom tasks per oelint

Set doc strings on the custom functions oelint-adv reports via
'oelint.task.docstrings': the three i.MX boot firmware deploy helpers,
the libubootenv uboot-config fixup handler, the qemu-qoriq wrapper
generator, the testfloat SoftFloat unpack step, the linux-imx device
tree compatibility handler and the imx-mp4-parser QA-skip hook.

imx-mp4-parser reuses the wording already used for the identical hook in
imx-parser, so the two prebuilt-binary recipes read the same.

opencv and libcamera are deliberately left alone.  Both recipes carry
their upstream recipe as a marked verbatim block ("meta-openembedded
copy"), and the two functions oelint flags -- do_unpack_extra and
do_package_recalculate_ipa_signatures -- sit inside those blocks, where
meta-openembedded sets no doc string.  Annotating them would break the
diff against upstream for no functional gain, so those two findings stay
visible.

bitbake never reads the 'doc' flag when computing task checksums --
bb/data.py build_dependencies() only consults vardeps, vardepvalue,
vardepsexclude, exports, postfuncs, prefuncs, lineno and filename -- so
these additions cannot change a signature or invalidate sstate.

Verified by re-linting each file.

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

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