dt-bindings: arm: pmu: Add Samsung Mongoose core compatible

Add the compatible for the Samsung Mongoose CPU PMU to the schema.

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>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20241026-mongoose-pmu-v1-1-f1a7448054be@gmail.com


Signed-off-by: Will Deacon <will@kernel.org>