DMC is non functional for ROCK Pi S anyway.

diff --git a/arch/arm64/boot/dts/rockchip/rk3308-rock-pi-s.dts b/arch/arm64/boot/dts/rockchip/rk3308-rock-pi-s.dts
index 4a72ffed8..0eb7cc628 100644
--- a/arch/arm64/boot/dts/rockchip/rk3308-rock-pi-s.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3308-rock-pi-s.dts
@@ -202,7 +202,7 @@
 
 &dmc {
 	center-supply = <&vdd_log>;
-	status = "okay";
+	status = "disabled";
 };
 
 &emmc {