It's nicer to use ARRAY_SIZE instead of hardcoding.  Had we always
been doing this it would have prevented a previous bug.  See commit
74c31ff9 ("clk: qcom: gpu_cc_gmu_clk_src has 5 parents, not 6").
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lkml.kernel.org/r/20200203103049.v4.10.I3bf44e33f4dc7ecca10a50dbccb7dc082894fa59@changeidSigned-off-by: Stephen Boyd <sboyd@kernel.org>