ci: Run deqp-gles3 and deqp-gles31 on RadeonSI
Only a fourth of the GLES3 tests and a fifth of the GLES31 tests for now, as the machine is quite slow and there's a problem with dEQP calling fesetround all the time and that being very expensive on x86_64.
Signed-off-by: Tomeu Vizoso tomeu.vizoso@collabora.com