of/unittest: Add test that of_address_to_resource() fails on non-translatable address

of_address_to_resource() on a non-translatable address should return an
error. Additionally, this case also triggers a spurious WARN for
missing #address-cells/#size-cells.

Link: https://lore.kernel.org/r/20250110215030.3637845-1-robh@kernel.org


Signed-off-by: Rob Herring (Arm) <robh@kernel.org>