clk: samsung: Make of_device_id array const

Array of struct of_device_id may be be const as expected by
of_match_table field and of_find_matching_node_and_match() function.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
diff --git a/drivers/clk/samsung/clk.h b/drivers/clk/samsung/clk.h
index 92131f9..66ab36b 100644
--- a/drivers/clk/samsung/clk.h
+++ b/drivers/clk/samsung/clk.h
@@ -333,7 +333,7 @@
 			struct samsung_clk_provider *ctx,
 			struct samsung_fixed_rate_clock *fixed_rate_clk,
 			unsigned int nr_fixed_rate_clk,
-			struct of_device_id *clk_matches);
+			const struct of_device_id *clk_matches);
 
 extern void samsung_clk_add_lookup(struct samsung_clk_provider *ctx,
 			struct clk *clk, unsigned int id);