lantiq: drop obsolete patch

ifxhcd never had roothub support but since kernel 3.x it was expected
that a roothub always exists.

The patched fixed a null pointer deref in the usb subsystem because of
the missing roothub.

Since ifxhcd is gone, this whole patch isn't required any longer.

Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/lantiq/patches-4.4/0032-USB-fix-roothub-for-IFXHCD.patch

@@ -1,31 +0,0 @@
-From 326714a47233e4a524afa0c8398276fddf0dbd4d Mon Sep 17 00:00:00 2001
-From: John Crispin <blogic@openwrt.org>
-Date: Thu, 6 Dec 2012 19:59:53 +0100
-Subject: [PATCH 32/36] USB: fix roothub for IFXHCD
-
----
- arch/mips/lantiq/Kconfig |    1 +
- drivers/usb/core/hub.c   |    2 +-
- 2 files changed, 2 insertions(+), 1 deletion(-)
-
---- a/arch/mips/lantiq/Kconfig
-+++ b/arch/mips/lantiq/Kconfig
-@@ -3,6 +3,7 @@ if LANTIQ
- config SOC_TYPE_XWAY
- 	bool
- 	select PINCTRL_XWAY
-+	select USB_ARCH_HAS_HCD
- 	default n
- 
- choice
---- a/drivers/usb/core/hub.c
-+++ b/drivers/usb/core/hub.c
-@@ -4356,7 +4356,7 @@ hub_port_init(struct usb_hub *hub, struc
- 		udev->ttport = hdev->ttport;
- 	} else if (udev->speed != USB_SPEED_HIGH
- 			&& hdev->speed == USB_SPEED_HIGH) {
--		if (!hub->tt.hub) {
-+		if (hdev->parent && !hub->tt.hub) {
- 			dev_err(&udev->dev, "parent hub has no TT\n");
- 			retval = -EINVAL;
- 			goto fail;