riscv: dts: AE250 support sd High-Speed mode

Enable High-Speed mode with cap-sd-highspeed in dts.

Signed-off-by: Rick Chen <rick@andestech.com>
Signed-off-by: Rick Chen <rickchen36@gmail.com>
diff --git a/arch/riscv/dts/ae250.dts b/arch/riscv/dts/ae250.dts
index 5dc4fb0..9a38345 100644
--- a/arch/riscv/dts/ae250.dts
+++ b/arch/riscv/dts/ae250.dts
@@ -74,6 +74,7 @@
 		fifo-depth = <0x10>;
 		reg = <0xf0e00000 0x1000>;
 		interrupts = <17 4>;
+		cap-sd-highspeed;
 	};
 
 	spi: spi@f0b00000 {