pmdomain: mtk-pm-domains: Fix spinlock recursion fix in probe

pmdomain: mtk-pm-domains: Fix spinlock recursion fix in probe

Remove scpsys_get_legacy_regmap(), replacing its usage with
of_find_node_with_property(). Explicitly call of_node_get(np) before each
of_find_node_with_property() to maintain correct node reference counting.

The of_find_node_with_property() function "consumes" its input by calling
of_node_put() internally, whether or not it finds a match.  Currently,
dev->of_node (np) is passed multiple times in sequence without incrementing
its reference count, causing it to be decremented multiple times and
risking early memory release.

Adding of_node_get(np) before each call balances the reference count,
preventing premature node release.

Fixes: c1bac49fe91f ("pmdomains: mtk-pm-domains: Fix spinlock recursion in probe")
Cc: stable@vger.kernel.org
Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com>
Tested-by: Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>