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/imx6q-hummingboard2-emmc-som-v15-u-boot.dtsi b/arch/arm/dts/imx6q-hummingboard2-emmc-som-v15-u-boot.dtsi
new file mode 100644
index 0000000..89fbec4
--- /dev/null
+++ b/arch/arm/dts/imx6q-hummingboard2-emmc-som-v15-u-boot.dtsi
@@ -0,0 +1 @@
+#include "imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi"