arm: dts: hummingboard: add cubox/hummingboard DT (part 2 of 2)

These DT files are copied from kernel v5.3 with no changes.

This is part 2 of 2 commits. Included are DT files for SOM rev 1.5, and
Hummingboard2 Gate/Edge.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi b/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi
new file mode 100644
index 0000000..d302b2e
--- /dev/null
+++ b/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "imx6qdl-u-boot.dtsi"
+
+/ {
+	board-detect {
+		compatible = "solidrun,hummingboard-detect";
+		detect-gpios = <
+			&gpio2 8 0
+			&gpio3 4 0
+			&gpio4 9 0
+			&gpio6 0 0
+			&gpio6 4 0
+		>;
+	};
+};
+
+&gpio2 {
+	u-boot,dm-pre-reloc;
+};
+
+&gpio3 {
+	u-boot,dm-pre-reloc;
+};
+
+&gpio4 {
+	u-boot,dm-pre-reloc;
+};
+
+&gpio6 {
+	u-boot,dm-pre-reloc;
+};
+
+&usdhc1 {
+	status = "disabled";
+};