arm64: dts: exynos: gs101-oriole: move common Pixel6 & 6Pro parts into a .dtsi

arm64: dts: exynos: gs101-oriole: move common Pixel6 & 6Pro parts into a .dtsi

In order to support Pixel 6 (Oriole), Pixel 6 Pro (Raven), Pixel 6a
(Bluejay), and all other versions correctly, we have to be able to
distinguish them properly as we add support for more features.

For example, Raven has a larger display. There are other differences,
like battery design capacity, etc.

Move all the parts that are common for now into a
gs101-pixel-common.dtsi, and just leave the display related things in
gs101-oriole.dts.

Signed-off-by: André Draszik <andre.draszik@linaro.org>
Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Link: https://lore.kernel.org/r/20250117-gs101-simplefb-v4-3-a5b90ca2f917@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>