USB: usbip: delete README file

The README file ni the drivers/usb/usbip/ directory is not needed
anymore, so just delete it.

Cc: Valentina Manea <valentina.manea.m@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: NShuah Khan <shuah@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/usbip/README

-TODO:
-	- more discussion about the protocol
-	- testing
-	- review of the userspace interface
-	- document the protocol
-
-Please send patches for this code to Greg Kroah-Hartman <greg@kroah.com>