usb: gadget: add Kconfig for OS descriptors

Add Kconfig for OS descriptors

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 7c0df5c..4a3b22e 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -98,6 +98,15 @@
 
 endif # USB_GADGET_DWC2_OTG
 
+config USB_GADGET_OS_DESCRIPTORS
+	bool "USB OS Feature Descriptors support"
+	help
+	  This is a porting patch from linux kernel: 37a3a533429e
+	  ("usb: gadget: OS Feature Descriptors support"), the original commit
+	  log see below:
+	  There is a custom (non-USB IF) extension to the USB standard:
+	  http://msdn.microsoft.com/library/windows/hardware/gg463182
+
 config CI_UDC
 	bool "ChipIdea device controller"
 	select USB_GADGET_DUALSPEED