arm64: dts: exynos: Add initial support for the Exynos 990 SoC

The Exynos 990 SoC is an ARMv8 mobile SoC found in Samsung Galaxy N/S20
series phones (x1sxxx, c1sxxx). Add minimal support for this SoC,
including:

- All 8 cores via PSCI
- ChipID
- Generic timer.
- Pinctrl

The devices using this SoC suffer from the same issue as Exynos 8895
caused by the stock Samsung bootloader, as it doesn't configure
CNTFRQ_EL0. Hence it's needed to hardcode the adequate frequency in the
timer node, otherwise the kernel panics.

Signed-off-by: Igor Belwon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>

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