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 <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=6851


Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Link: https://lore.kernel.org/r/20231017031635.105993-1-yang.lee@linux.alibaba.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>