usb: core: Add USB_QUIRK_DELAY_CTRL_MSG to usbcore quirks

There's a new quirk, USB_QUIRK_DELAY_CTRL_MSG. Add it to usbcore quirks
for completeness.
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/admin-guide/kernel-parameters.txt

@@ -4421,7 +4421,9 @@
 					calculation);
 				m = USB_QUIRK_DISCONNECT_SUSPEND (Device needs
 					to be disconnected before suspend to
-					prevent spurious wakeup)
+					prevent spurious wakeup);
+				n = USB_QUIRK_DELAY_CTRL_MSG (Device needs a
+					pause after every control message);
 			Example: quirks=0781:5580:bk,0a5c:5834:gij
 
 	usbhid.mousepoll=

drivers/usb/core/quirks.c

@@ -124,6 +124,9 @@ static int quirks_param_set(const char *val, const struct kernel_param *kp)
 			case 'm':
 				flags |= USB_QUIRK_DISCONNECT_SUSPEND;
 				break;
+			case 'n':
+				flags |= USB_QUIRK_DELAY_CTRL_MSG;
+				break;
 			/* Ignore unrecognized flag characters */
 			}
 		}