pmdomain: mediatek: Respect PD relationships during error cleanup

In case any probe error occurs (usually, a probe deferral) the
power domains shall be cleaned up while respecting their child
to parent relationship, or the system may freeze.

In order to do that without any memory footprint impacts after
the fact, allocate a temporary array in the probe function and
use it to store the indices of the added power domains in the
correct order.

This will be used in the error cleanup path and will be freed
at the end regardless of the probe status as, when the probing
succeeds, the genpd API takes care of unregistering all PDs in
the correct order anyway.

Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Ulf Hansson <ulfh@kernel.org>

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