ARM: dts: sun8i-a83t-tbs-a711: HM5065 doesn't like such a high voltage

Lowering the voltage solves the quick image degradation over time
(minutes), that was probably caused by overheating.

Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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