drm/msm: Add adreno_is_a640_family()

Combine adreno_is_a640() and adreno_is_a680().

Signed-off-by: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20210807163019.379003-1-robdclark@gmail.com


Signed-off-by: Rob Clark <robdclark@chromium.org>