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

As clearly seen on other non-MediaTek platforms, this is known to
eventually produce regressions in the future, as drivers may break
ABI and stop working with older firmware versions.

Although the firmware-name property was used in multiple MediaTek
devicetrees for the System Companion Processor (SCP) node, avoid
doing the same on MT8390 to lessen eventual ABI breakages that may
happen with a driver update to change the firmware retrieval logic
for the SCP.

This reverts commit 2f0066d.

Link: https://lore.kernel.org/r/20250520111002.282841-1-angelogioacchino.delregno@collabora.com
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Author: AngeloGioacchino Del Regno

arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi

@@ -1177,7 +1177,6 @@
 };
 
 &scp_c0 {
-	firmware-name = "mediatek/mt8188/scp.img";
 	memory-region = <&scp_mem>;
 	status = "okay";
 };