bcm53xx: update patch adding fake USB doorbell

Rob suggested I should use of_machine_is_compatible insteak of a new
property and updated patch has been sent.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

target/linux/bcm53xx/patches-4.4/180-usb-xhci-add-support-for-performing-fake-doorbell.patch

@@ -1,40 +1,22 @@
-From 37df205cdb69d17d5e815385fc1af3c97d1fe20b Mon Sep 17 00:00:00 2001
 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
 Date: Sat, 1 Oct 2016 22:54:48 +0200
 Subject: [PATCH] usb: xhci: add support for performing fake doorbell
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
 
 Broadcom's Northstar XHCI controllers seem to need a special start
-procedure to work correctly. There isn't any official documentation on
+procedure to work correctly. There isn't any official documentation of
 this, the problem is that controller doesn't detect any connected
 devices with default setup. Moreover connecting USB device to controller
 that doesn't run properly can cause SoC's watchdog issues.
 
 A workaround that was successfully tested on multiple devices is to
-perform a fake doorbell. This patch adds code for doing that and a DT
-binding enabling it.
-
-Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+perform a fake doorbell. This patch adds code for doing this and enables
+it on BCM4708 family.
 ---
- Documentation/devicetree/bindings/usb/usb-xhci.txt |  2 +
- drivers/usb/host/xhci-plat.c                       |  6 +++
- drivers/usb/host/xhci.c                            | 63 ++++++++++++++++++++--
+ drivers/usb/host/xhci-plat.c |  6 +++++
+ drivers/usb/host/xhci.c      | 63 +++++++++++++++++++++++++++++++++++++++++---
  drivers/usb/host/xhci.h      |  1 +
- 4 files changed, 69 insertions(+), 3 deletions(-)
+ 3 files changed, 67 insertions(+), 3 deletions(-)
 
---- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
-+++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
-@@ -12,6 +12,8 @@ Required properties:
- Optional properties:
-   - clocks: reference to a clock
-   - usb3-lpm-capable: determines if platform is USB3 LPM capable
-+  - usb3-fake-doorbell: determines if controller requires a fake doorbell when
-+			starting it
- 
- Example:
- 	usb@f0931000 {
 --- a/drivers/usb/host/xhci-plat.c
 +++ b/drivers/usb/host/xhci-plat.c
 @@ -38,12 +38,18 @@ static const struct xhci_driver_override
@@ -51,7 +33,7 @@ Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  	 */
  	xhci->quirks |= XHCI_PLAT;
 +
-+	if (node && of_property_read_bool(node, "usb3-fake-doorbell"))
++	if (node && of_machine_is_compatible("brcm,bcm4708"))
 +		xhci->quirks |= XHCI_FAKE_DOORBELL;
  }