dt-bindings: display: novatek,nt36672a: correct VDDIO supply

The nt36672a bindings were added with a mistake on VDDIO supply calling
it in one place vddio and in other vddi0.  Typical name is rather vddio
which is also now used by DTS (sdm845-xiaomi-beryllium-common.dtsi) and
Linux driver.

Fixes: c2abcf30 ("dt-bindings: display: novatek,nt36672a: Fix unevaluated properties warning")
Fixes: 9528a024

 ("dt-bindings: display: panel: Add bindings for Novatek nt36672a")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230326155425.91181-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Rob Herring <robh@kernel.org>