arm64: dts: exynos8895-dreamlte: enable support for the touchscreen

arm64: dts: exynos8895-dreamlte: enable support for the touchscreen

The Samsung Galaxy S8 uses a Samsung s6sy761 touchscreen over hsi2c23.
Add a node for it in order to allow using the touchscreen as long as
the previous bootloader has enabled the required regulators because
there's no support for PMIC yet.

Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
Link: https://lore.kernel.org/r/20250105161344.420749-7-ivo.ivanov.ivanov1@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>