clk: Add stubs for of_clk_*() APIs when CONFIG_OF=n

Compiling the versatile clock driver with COMPILE_TEST=y and CONFIG_OF=n leads to the following error:

drivers/clk/versatile/clk-sp810.c: In function 'clk_sp810_of_setup':
drivers/clk/versatile/clk-sp810.c:103:6: error: implicit declaration of
function 'of_clk_parent_fill' [-Werror=implicit-function-declaration]

Silence it by providing stubs APIs for of_clk_parent_fill(). Throw in a stub for of_clk_get_parent_count() too because we're in the area.

---
 include/linux/clk-provider.h | 9 +++++++++
 1 file changed, 9 insertions(+)

index 837cd7c7c8a7..ff7284fb37b2 100644
@@ -726,6 +726,15 @@ static inline struct clk *of_clk_src_onecell_get(
 {
 	return ERR_PTR(-ENOENT);
 }
+static inline int of_clk_get_parent_count(struct device_node *np)
+{
+	return 0;
+}
+static inline int of_clk_parent_fill(struct device_node *np,
+				     const char **parents, unsigned int size)
+{
+	return 0;
+}
 static inline const char *of_clk_get_parent_name(struct device_node *np,
 						 int index)
 {

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