Add a paragraph from linux/drivers/usb/misc/emi26_fw.h that was missing
in license.txt.
and which may not be reproduced, used, sold or transferred to
any third party without Emagic's written consent. All Rights Reserved.
+Permission is hereby granted for the distribution of this firmware
+image as part of a Linux or other Open Source operating system kernel
+in text or binary form as required.
+
This firmware may not be modified and may only be used with the
Emagic EMI 2|6 Audio Interface. Distribution and/or Modification of
any driver which includes this firmware, in whole or in part,