dt-bindings: arm: cpus: Add Samsung Mongoose M3

dt-bindings: arm: cpus: Add Samsung Mongoose M3

Add the compatible for Samsung Mongoose M3 CPU core to the schema.
Mongoose M3 (codenamed Meerkat) is the big core in Exynos9810 SoC,
designed by Samsung. It implements ARMv8.2-A ISA.

Co-developed-by: Maksym Holovach <nergzd@nergzd723.xyz>
Signed-off-by: Maksym Holovach <nergzd@nergzd723.xyz>
Signed-off-by: Markuss Broks <markuss.broks@gmail.com>
Link: https://lore.kernel.org/r/20241026-exynos9810-v3-1-b89de9441ea8@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>