arm64: dts: hikey: Enable SDIO high-speed mode on WL1835 module

According to hardware documentation, the WL1835MOD WiFi chip supports SDIO high-speed mode, which increases the clock to 50 MHz. This results in a modest increase in throughput.

---
 arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 1 +
 1 file changed, 1 insertion(+)

index 5d5aa4f4a235..a5e0cc4370e1 100644
@@ -322,6 +322,7 @@
 
 		dwmmc_2: dwmmc2 at f723f000 {
 			bus-width = <0x4>;
+			cap-sd-highspeed;
 			non-removable;
 			vmmc-supply = <&reg_vdd_3v3>;
 			mmc-pwrseq = <&wl1835_pwrseq>;

2.11.0