usb: storage: drop freezer.h usage

usb-storage does not use any freezer apis, so drop the inclusion of
freezer.h from the drivers/usb/storage/usb.c file.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/storage/usb.c

@@ -52,7 +52,6 @@
 
 #include <linux/sched.h>
 #include <linux/errno.h>
-#include <linux/freezer.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/kthread.h>