Odroid-XU3: dts: enable ADC, with request for pre-reloc bind

This ADC is required for Odroid's board revision detection.
The pre-reloc request is enabled, since board detection will
be done in one of early function call.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/dts/exynos5422-odroidxu3.dts

@@ -31,6 +31,11 @@
 			0xb0000000 0xea00000>;
 	};
 
+	adc@12D10000 {
+		u-boot,dm-pre-reloc;
+		status = "okay";
+	};
+
 	i2c@12CA0000 {
 		s2mps11_pmic@66 {
 			compatible = "samsung,s2mps11-pmic";