clk: tegra: Constify pdiv-to-hw mappings

This is static data that is never modified, so make it const.

Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/clk/tegra/clk.h

@@ -233,7 +233,7 @@ struct tegra_clk_pll_params {
 	int		stepb_shift;
 	int		lock_delay;
 	int		max_p;
-	struct pdiv_map *pdiv_tohw;
+	const struct pdiv_map *pdiv_tohw;
 	struct div_nmp	*div_nmp;
 	struct tegra_clk_pll_freq_table	*freq_table;
 	unsigned long	fixed_rate;