rk3588: mark enable sfc overlay as unknown

This overlay is only applicable to the external spiflash series of rk3588s.
Conflict with rock-5a-spi-flash.

Signed-off-by: Ken Wang <[email protected]>

Author: Ken-Vamrs

arch/arm64/boot/dts/rockchip/overlays/rk3588-enable-sfc.dts

@@ -4,7 +4,7 @@
 / {
 	metadata {
 		title = "Enable SFC";
-		compatible = "rockchip,rk3588";
+		compatible = "unknown";
 		category = "misc";
 		exclusive = "sfc", "sdhci";
 		description = "Enable SFC.