usb: Add explicit of.h of_platform.h include

Several USB drivers use of_platform_* functions which are declared in
of_platform.h. of_platform.h gets implicitly included by of_device.h,
but that is going to be removed soon. Nothing else depends on of_device.h
so it can be dropped.

Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Acked-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230410232639.1561152-1-robh@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/dwc3-am62.c

@@ -11,7 +11,7 @@
 #include <linux/platform_device.h>
 #include <linux/mfd/syscon.h>
 #include <linux/of.h>
-#include <linux/of_device.h>
+#include <linux/of_platform.h>
 #include <linux/pm_runtime.h>
 #include <linux/clk.h>
 #include <linux/regmap.h>

drivers/usb/gadget/udc/rzv2m_usb3drd.c

@@ -6,7 +6,7 @@
  */
 
 #include <linux/io.h>
-#include <linux/of_device.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>

drivers/usb/mtu3/mtu3_host.c

@@ -11,7 +11,7 @@
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/mfd/syscon.h>
-#include <linux/of_device.h>
+#include <linux/of_platform.h>
 #include <linux/regmap.h>
 
 #include "mtu3.h"