of: Fix brace position for struct of_device_id definition

Currently it is not easy to grep for the definition of struct of_device_id.
This is trivially fixed by moving the brace to the right place.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>