arm64: dts: mediatek: mt8390-genio-common: Add firmware-name for scp0

Add the firmware-name property for SCP core0 so the firmware can be
loaded from its canonical location in the linux-firmware repository.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20250421-scp-dual-core-mt8390-v2-5-c84117a959a9@collabora.com


Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>