Re: dtc: Cleanup testsuite organization

So, like, the other day David Gibson mumbled:

run_tests.sh from the dtc testsuite currently has a facility ro run
just "functional" or just "stress" tests.  This distinction is carried
over from libhugetlbfs where the test framework originated, and where
it made sense.

In dtc, we have no stress tests, so running these subsections isn't
particularly interesting.  This patch removes these test subsets,
instead defining a single "libfdt" test subset for testcases related
to libfdt (and not dtc proper only.  Currently that's all of the
testcases, but with any luck we'll have some dtc testcases in the
future.

Signed-off-by: David Gibson <redacted>

Applied.

jdl