arm64: dts: allwinner: a100: Fix thermal zone node name

The thermal zones one the A100 are called $device-thermal-zone.

However, the thermal zone binding explicitly requires that zones are
called *-thermal. Let's fix it.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20210901091852.479202-50-maxime@cerno.tech