tests/avocado: mips: add hint for fetchasset plugin

tests/avocado: mips: add hint for fetchasset plugin

Avocado's fetchasset plugin runs before the actual Avocado job (and
any test).  It analyses the test's code looking for occurrences of
"self.fetch_asset()" in the either the actual test or setUp() method.
It's not able to fully analyze all code, though.

The way these tests are written, make the fetchasset plugin blind to
the assets.  This adds some more code duplication, true, but it will
aid the fetchasset plugin to download or verify the existence of these
assets in advance.

Signed-off-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240726134438.14720-3-crosa@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>