[meta-zephyr][hardknott] backport tmpfsdir from master

Jon Mason

Hey Naveen,
The hardknott branch in meta-zephyr needs the tmpfsdir patch
(678600bee6092e58110a826a9cbefc2f5c52916c) from the master branch
cherry-picked back to hardknott. It has the same issue master had
with breaking when trying to run qemu. Can you please pull it in?


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