arm64: dts: hikey: Remove keep-power-in-suspend property

Remove the keep-power-in-suspend property because it keeps wifi power
on during suspend. This property is only required when enabling WoWLAN
and should only be enabled based on need.
Signed-off-by: Ryan Grachek <ryan@edited.us>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts

@@ -323,7 +323,6 @@ dwmmc_2: dwmmc2@f723f000 {
 			bus-width = <0x4>;
 			non-removable;
 			cap-power-off-card;
-			keep-power-in-suspend;
 			vmmc-supply = <&reg_vdd_3v3>;
 			mmc-pwrseq = <&wl1835_pwrseq>;