Add DT flag to build device tree overlays with __symbols__ information. There can be other overlays which depend on these. Bug 3847762 Change-Id: Icc23b05127387bceb27622c39fd888e671c9c176 Reviewed-on: https://git-master.nvidia.com/r/c/device/hardware/nvidia/platform/t23x/concord-generic-dts/+/2823115 Reviewed-by: svcacv <svcacv@nvidia.com> Reviewed-by: Sameer Pujar <spujar@nvidia.com> Reviewed-by: Sheetal . <sheetal@nvidia.com> Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com> Tested-by: Sheetal . <sheetal@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>