of_clk_get_parent_count() and of_clk_get_parent_name() never modify the
device nodes passed, so they can be const.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://lkml.kernel.org/r/20200212094317.1150-1-geert+renesas@glider.beSigned-off-by: NStephen Boyd <sboyd@kernel.org>