clk: Use static inline functions instead of macros for dummies

if CONFIG_OF=n:

    drivers/clk/clk-cs2000-cp.c: In function ‘cs2000_remove’:
    drivers/clk/clk-cs2000-cp.c:453:22: warning: unused variable ‘np’ [-Wunused-variable]
      struct device_node *np = dev->of_node;
			  ^

Convert dummies of_clk_del_provider() and of_clk_init() from macros to
static inline functions to kill such compiler warnings.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

include/linux/clk-provider.h

@@ -715,8 +715,7 @@ static inline int of_clk_add_provider(struct device_node *np,
 {
 	return 0;
 }
-#define of_clk_del_provider(np) \
-	{ while (0); }
+static inline void of_clk_del_provider(struct device_node *np) {}
 static inline struct clk *of_clk_src_simple_get(
 	struct of_phandle_args *clkspec, void *data)
 {
@@ -741,8 +740,7 @@ static inline const char *of_clk_get_parent_name(struct device_node *np,
 {
 	return NULL;
 }
-#define of_clk_init(matches) \
-	{ while (0); }
+static inline void of_clk_init(const struct of_device_id *matches) {}
 #endif /* CONFIG_OF */
 
 /*