sd-600eval: remove machine config
sd-600eval: remove machine config

Upstream Linux kernel has stopped supporting Arrow SD600 Eval board in
2018 (merged into 5.0). Drop support for this board too.

Signed-off-by: Dmitry Baryshkov <2dcd7ecf02101ef1dca344c0511f3ffb180907c2@linaro.org>

ndechesne/meta-qcom,ndechesne/meta-qcom,ndechesne/meta-qcom