clk: wm831x: 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.

Cc: Mark Brown <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/clk-wm831x.c

···
  *
  */
 
-#include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/delay.h>
 #include <linux/module.h>