ARM: bcm2835-rpi-zero-w: Add missing pinctrl name

Define the sdhci pinctrl state as "default" so it gets applied
correctly and to match all other RPis.

Fixes: 2c7c040c ("ARM: dts: bcm2835: Add Raspberry Pi Zero W")
Signed-off-by: Nick Hudson <skrll@netbsd.org>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm2835-rpi-zero-w.dts

@@ -112,6 +112,7 @@ &hdmi {
 &sdhci {
 	#address-cells = <1>;
 	#size-cells = <0>;
+	pinctrl-names = "default";
 	pinctrl-0 = <&emmc_gpio34 &gpclk2_gpio43>;
 	bus-width = <4>;
 	mmc-pwrseq = <&wifi_pwrseq>;