dt-bindings: mfd: mediatek,mt8195-scpsys: Add support for MT6893

Add a compatible string for the scpsys block found in the MediaTek
Dimensity 1200 (MT6893) SoC.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Acked-by: "Rob Herring (Arm)" <robh@kernel.org>
Link: https://lore.kernel.org/r/20250416120225.147826-1-angelogioacchino.delregno@collabora.com


Signed-off-by: Lee Jones <lee@kernel.org>