dt-bindings: input: mediatek,pmic-keys: Add compatible for MT6359 keys

Add a compatible for the keys found on the MT6359 PMIC.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Macpaul Lin <macpaul.lin@mediatek.com>
Link: https://lore.kernel.org/r/20241008074137.20269-1-angelogioacchino.delregno@collabora.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>