dt-bindings: thermal: cleanup examples indentation

dt-bindings: thermal: cleanup examples indentation

Preferred indentation for DTS examples in the bindings is 4-space.  It
is also preferred not to have redundant/unused labels. No functional
change

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240705-dt-bindings-thermal-allof-v1-22-554061b52fbc@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>