[PATCH v4] dts: update test suite names to be clear and consistent

[Luca Vizzarro]

Looks ok to me. Thank you Andrew.

The only thing I'd suggest is to use `git mv` next time you rename 
files. The diff is quite chaotic and not easy to read unfortunately.

I would prefer if you were to send a v5 doing that just to be extra sure 
that no bugs were introduced in the process.

Reviewed-by: Luca Vizzarro <luca.vizzarro at arm.com>