arm64: dts: exynos: gs101: move serial_0 pinctrl-0/names to dtsi

arm64: dts: exynos: gs101: move serial_0 pinctrl-0/names to dtsi

The pinctrl nodes are coming from the shared gs101-pinctrl.dtsi,
thus the pinctrl-0/names shall stay in dtsi. Move them.

Reviewed-by: André Draszik <andre.draszik@linaro.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Link: https://lore.kernel.org/r/20240326151301.348932-3-tudor.ambarus@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>