clk: tegra: add common infra for DT clocks

Introduce a common infrastructure for sharing clock initialization between
SoCs.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>

drivers/clk/tegra/clk.h

@@ -568,6 +568,11 @@ struct tegra_clk_duplicate {
 		},				\
 	}
 
+struct tegra_clk {
+	int			dt_id;
+	bool			present;
+};
+
 void tegra_init_from_table(struct tegra_clk_init_table *tbl,
 		struct clk *clks[], int clk_max);
 
@@ -577,6 +582,8 @@ void tegra_init_dup_clks(struct tegra_clk_duplicate *dup_list,
 struct tegra_clk_periph_regs *get_reg_bank(int clkid);
 struct clk **tegra_clk_init(int num, int periph_banks);
 
+struct clk **tegra_lookup_dt_id(int clk_id, struct tegra_clk *tegra_clk);
+
 void tegra_add_of_provider(struct device_node *np);
 
 void tegra114_clock_tune_cpu_trimmers_high(void);