arm64: dts: exynos: add initial support for exynosautov9 SoC

Add minimal support for ExynosAuto v9 SoC[1].

- Enumarate all pinctrl nodes
- UART with exynos850 compatible
- UFS0 HCI + Phy

Like exynos850, this also uses fixed-rate clock nodes until clock driver
has been supported. The clock nodes are initialized on bootloader stage
thus we don't need to control them so far.

[1]: https://www.samsung.com/semiconductor/minisite/exynos/products/automotiveprocessor/exynos-auto-v9/

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Link: https://lore.kernel.org/r/20211012002314.38965-3-chanho61.park@samsung.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>