clk: Make of_clk_get_from_provider() available to modules

Export symbol of_clk_get_from_provider so it can be used in
loadable kernel modules

Signed-off-by: Andrew F. Davis <[e-mail]>
Signed-off-by: Michael Turquette <[e-mail]>

drivers/clk/clk.c

···
 {
 	return __of_clk_get_from_provider(clkspec, NULL, __func__);
 }
+EXPORT_SYMBOL_GPL(of_clk_get_from_provider);
 
 int of_clk_get_parent_count(struct device_node *np)
 {