ldelf, libutee: rework support of DT_INIT_ARRAY/DT_FINI_ARRAY

Now that we have the standard function dl_iterate_phdr() in libutee, we
can use it to process the initialization and finalization arrays in the
ELF files and deprecate the ad-hoc structure __init_fini_info
introduced in commit dd655cb9906c ("ldelf, ta: add support for
DT_INIT_ARRAY and DT_FINI_ARRAY") [1].
Unfortunately, removing __init_fini_info is not an option if we want to
ensure backward compatibility. This concerns only TAs which use ELF
initialization and/or finalization functions.

[1] Released in version 3.9.0.

Signed-off-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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