board: ge: bx50v3: Enable CONFIG_DM

Add simplified, generalised, bx50v3 device tree and enable CONFIG_DM.

Signed-off-by: Ian Ray <ian.ray@ge.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 82f28b2..93559a3 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -699,6 +699,8 @@
 	mt7623n-bananapi-bpi-r2.dtb \
 	mt7629-rfb.dtb
 
+dtb-$(CONFIG_TARGET_GE_BX50V3) += imx6q-bx50v3.dtb
+
 targets += $(dtb-y)
 
 # Add any required device tree compiler flags here