clk: export fixed-factor, gate & mux registration

These registration calls may be used by loadable modules. Export them.

Signed-off-by: Mike Turquette <mturquette@linaro.org>
diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
index 790306e..2b28a00 100644
--- a/drivers/clk/clk-gate.c
+++ b/drivers/clk/clk-gate.c
@@ -161,3 +161,4 @@
 
 	return clk;
 }
+EXPORT_SYMBOL_GPL(clk_register_gate);