Loading different DTS files from U-Boot

We're at a point where it probably makes sense to separate the generic
"hey, let's experiment with this" Clearfog config from a device-specific
"I'm just a CL-ROADMv2" or "I'm a future SDN ROADM thingy".

The CL-ROADMv2 is branched out in order to cement this legacy, one-off
device in stone. Note that ADT7643 is still being loaded in a crazy way
as explained by https://gerrit.cesnet.cz/483 .

Change-Id: Ie86d37cf94c36077134afa54cacdae6962dd8c11
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index 8e6d152..5172ccc 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -22,7 +22,7 @@
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/linux.fragment $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/kconfig"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_USE_CUSTOM_DTS=y
-BR2_LINUX_KERNEL_CUSTOM_DTS_PATH="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/czechlight-clearfog.dts"
+BR2_LINUX_KERNEL_CUSTOM_DTS_PATH="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/czechlight-clearfog.dts $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/CL-ROADMv2-clearfog.dts"
 BR2_LINUX_KERNEL_INSTALL_TARGET=y
 BR2_PACKAGE_LINUX_TOOLS_GPIO=y
 BR2_PACKAGE_LINUX_TOOLS_PERF=y