ARM: dts: rmobile: Restore increase off-on delay on the SD Vcc regulator

This patch restores commit c49d0ac38a76 ("ARM: dts: rmobile: Increase off-on
delay on the SD Vcc regulator"), which was accidentally dropped during DT
resync in commit 317d13ac6307 ("ARM: dts: rmobile: Synchronize Gen3 DTs with
Linux 5.0").

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Fixes: 317d13ac6307 ("ARM: dts: rmobile: Synchronize Gen3 DTs with Linux 5.0")
diff --git a/arch/arm/dts/r8a7796-m3ulcb-u-boot.dts b/arch/arm/dts/r8a7796-m3ulcb-u-boot.dts
index 1defe84..314eacc 100644
--- a/arch/arm/dts/r8a7796-m3ulcb-u-boot.dts
+++ b/arch/arm/dts/r8a7796-m3ulcb-u-boot.dts
@@ -30,3 +30,7 @@
 	mmc-hs400-1_8v;
 	max-frequency = <200000000>;
 };
+
+&vcc_sdhi0 {
+	u-boot,off-on-delay-us = <20000>;
+};