Revert "usb:cdns3 Add Cadence USB3 DRD Driver"

This reverts commit 8bc1901ca7.

It's broken.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Pawel Laszczak <pawell@cadence.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/Kconfig

@@ -113,8 +113,6 @@ source "drivers/usb/usbip/Kconfig"
 
 endif
 
-source "drivers/usb/cdns3/Kconfig"
-
 source "drivers/usb/mtu3/Kconfig"
 
 source "drivers/usb/musb/Kconfig"