phy: Remove duplicated include in phy-ralink-usb.c

./drivers/phy/ralink/phy-ralink-usb.c: linux/platform_device.h is included more than once.

Reported-by: Abaci Robot <[e-mail]>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=6851
Signed-off-by: Yang Li <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/phy/ralink/phy-ralink-usb.c

···
 #include <linux/of.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
-#include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>