ARM: dts: sun8i: add a delay after reset xr819 on Orange Pi Zero

XR819 seems to need a delay after its reset line to be deasserted,
otherwise it may not respond MMC commands correctly, and fail to
initialize.

Add a 200ms delay in the mmc-pwrseq.
Signed-off-by: NIcenowy Zheng <icenowy@aosc.xyz>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts

@@ -92,6 +92,7 @@
 	wifi_pwrseq: wifi_pwrseq {
 		compatible = "mmc-pwrseq-simple";
 		reset-gpios = <&r_pio 0 7 GPIO_ACTIVE_LOW>;
+		post-power-on-delay-ms = <200>;
 	};
 };