clk: Remove a useless include

<linux/rational.h> is not needed for these drivers. Remove the
corresponding #include.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/12dd5cb49efa7714f8e0389e4c7b3bc829e8a90e.1668289299.git.christophe.jaillet@wanadoo.fr
Acked-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/clk-versaclock5.c

@@ -20,7 +20,6 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
-#include <linux/rational.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 

drivers/clk/meson/clk-pll.c

@@ -32,7 +32,6 @@
 #include <linux/io.h>
 #include <linux/math64.h>
 #include <linux/module.h>
-#include <linux/rational.h>
 
 #include "clk-regmap.h"
 #include "clk-pll.h"

drivers/clk/rockchip/clk.c

@@ -21,7 +21,6 @@
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 #include <linux/reboot.h>
-#include <linux/rational.h>
 
 #include "../clk-fractional-divider.h"
 #include "clk.h"