arm64: dts: exynos: Add initial support for Samsung Galaxy S20 FE (r8s)

arm64: dts: exynos: Add initial support for Samsung Galaxy S20 FE (r8s)

Add initial support for the Samsung Galaxy S20 FE (r8s/SM-G780F) device.
Its launch was in 2020 and also based on the Exynos 990 SoC.
It is only configured with 6GB of RAM, although storage options may differ.

This device tree adds support for the following:

- SimpleFB
- 6GB RAM
- Buttons

Signed-off-by: Denzeel Oliva <wachiturroxd150@gmail.com>
Link: https://lore.kernel.org/r/20241114143636.374-3-wachiturroxd150@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>