arm64: dts: mediatek: mt8183: Fix pinctrl node names

Fix the pinctrl node names to adhere to the bindings, as the main
pin node is supposed to be named like "uart0-pins" and the pinmux
node named like "pins-bus".

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Fei Shao <fshao@chromium.org>
Link: https://lore.kernel.org/r/20250724083914.61351-30-angelogioacchino.delregno@collabora.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>