ARM: dts: imx6ul-lite*: add DTS files for liteSOM and liteboard

Import liteSOM and liteboard dts files from Linux v4.20. They will
be used after transition to driver model and device-tree based boot.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index ca50623..cb814e9 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -463,6 +463,8 @@
 	imx6ul-opos6uldev.dtb \
 	imx6ul-14x14-evk.dtb \
 	imx6ul-9x9-evk.dtb \
+	imx6ul-9x9-evk.dtb \
+	imx6ul-liteboard.dtb \
 	imx6ul-phycore-segin.dtb
 
 dtb-$(CONFIG_MX6ULL) += imx6ull-14x14-evk.dtb