OETestDepends doesn't work with parallelism and in this case we don't
really need this dependency, it would just short out some tests quickly
in the rare case the esdk environment was broken.
Currently this is masking tests which is a much worse problem and we
can't make OETestDepends work reliably with parallelism so drop the
dependencies.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>