ARM: u300: enable MMC/SD card from device tree

This adds support for the U300 MMC/SD card slot from the device
tree boot. No other changes needed.

Signed-off-by: Linus Walleij <[e-mail]>

arch/arm/boot/dts/ste-u300.dts

···
 			interrupt-parent = <&vicb>;
 			interrupts = <20>;
 		};
+
+		mmcsd: mmcsd@c0001000 {
+			compatible = "arm,pl18x", "arm,primecell";
+			reg = <0xc0001000 0x1000>;
+			interrupt-parent = <&vicb>;
+			interrupts = <6 7>;
+			max-frequency = <24000000>;
+			bus-width = <4>; // SD-card slot
+			mmc-cap-mmc-highspeed;
+			mmc-cap-sd-highspeed;
+			cd-gpios = <&gpio 12 0x4>;
+			cd-inverted;
+			vmmc-supply = <&ab3100_ldo_g_reg>;
+		};
 	};
 };