The Bazel WORKSPACE file in build/kernel/kleaf is not
sufficient for our usecase. We must add a nested
workspace for host DTC build.
Add the custom workspace file here so we can link it
to the top-level via repo manifest.
Change-Id: Ic260a335bae0bc43ba8b0ec482588c68e62c2a80
Signed-off-by: John Moon <quic_johmoo@quicinc.com>