tests/functional: expand tests to cover virgl

tests/functional: expand tests to cover virgl

Add two more test modes using glmark2-wayland to exercise the OpenGL
pass-through modes with virgl. Virgl can run with or without the
hostmem blob support. To avoid repeating ourselves too much we make
the initial pass a simple --validate pass.

We might want to eventually add more directed tests and individual
features later on but the glmark/vkmark tests are a good general
smoke test for accelerated 3D.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250304222439.2035603-7-alex.bennee@linaro.org>