ARM: dts: imx6qdl-microsom.dtsi: avoid boot-time UHS warning

Avoid the following warning:

sdhci-esdhc-imx 2190000.usdhc: could not get ultra high speed state, work on normal mode

which occurs regularly at boot each time the SDHCI interface for the
Broadcom WiFi is probed at boot.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-microsom.dtsi

@@ -154,6 +154,7 @@
 	bus-width = <4>;
 	mmc-pwrseq = <&usdhc1_pwrseq>;
 	keep-power-in-suspend;
+	no-1-8-v;
 	non-removable;
 	vmmc-supply = <&reg_brcm>;
 	status = "okay";