clk: mux: Remove clk.h include

Clock provider drivers generally shouldn't include clk.h because
it's the consumer API. Remove the include here because this is a
provider driver.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/clk-mux.c

@@ -10,7 +10,6 @@
  * Simple multiplexer clock implementation
  */
 
-#include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/module.h>
 #include <linux/slab.h>