This gets us back to the behavior we used to have for freedreno: clicking
play on arm_test gets you testing of the ARM platforms that aren't under
arm-build (the LAVA runners).
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
(cherry picked from commit 601a029e67)
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5548>