verification/rvgen: Add golden and spec folders for tests

Create reference models specifications and generated files in the golded
folder. Those can be used as reference to validate rvgen still gene

verification/rvgen: Add golden and spec folders for tests

Create reference models specifications and generated files in the golded
folder. Those can be used as reference to validate rvgen still generates
files as expected in automated tests.

Reviewed-by: Nam Cao <namcao@linutronix.de>
Link: https://lore.kernel.org/r/20260723074534.43521-8-gmonaco@redhat.com
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>

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