arm64: dts: marvell: 7040-db: Add the carrier detect pin for SD card on CP

The SD card slot connected to the SD controller of the CP part has a
carrier detect pin connected the gpio expander. This patch enables it
allowing supporting the hotplug event for the SD card.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm64/boot/dts/marvell/armada-7040-db.dts

@@ -239,7 +239,7 @@ &cpm_sdhci0 {
 	status = "okay";
 	bus-width = <4>;
 	no-1-8-v;
-	non-removable;
+	cd-gpios = <&expander0 12 GPIO_ACTIVE_LOW>;
 };
 
 &cpm_mdio {