clk: export some clk_hw function symbols for module drivers

clk-provider.h provides clk_hw_is_prepared(), clk_hw_is_enabled() and
clk_hw_is_prepared() but these symbols are not exported for the
modules which prevents a clock driver using them to be compiled as
a module. Export them to fix the problem.
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lkml.kernel.org/r/20190201125841.26785-2-jbrunet@baylibre.com

drivers/clk/clk.c

@@ -394,16 +394,19 @@ bool clk_hw_is_prepared(const struct clk_hw *hw)
 {
 	return clk_core_is_prepared(hw->core);
 }
+EXPORT_SYMBOL_GPL(clk_hw_is_prepared);
 
 bool clk_hw_rate_is_protected(const struct clk_hw *hw)
 {
 	return clk_core_rate_is_protected(hw->core);
 }
+EXPORT_SYMBOL_GPL(clk_hw_rate_is_protected);
 
 bool clk_hw_is_enabled(const struct clk_hw *hw)
 {
 	return clk_core_is_enabled(hw->core);
 }
+EXPORT_SYMBOL_GPL(clk_hw_is_enabled);
 
 bool __clk_is_enabled(struct clk *clk)
 {