The test clock isn't in the bindings and apparently it's not used by
anyone upstream.  Remove it.
Suggested-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20210405224743.590029-16-dmitry.baryshkov@linaro.orgSigned-off-by: Stephen Boyd <sboyd@kernel.org>