IntcSST2: Add firmware for Intel Broadwell SST DSP

Add firmware file and licence for Intel Broadwell SST DSP audio.
The firmware is distributed under Intel Free Redistribution License.
Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Kyle McMartin <kyle@kernel.org>

LICENCE.IntcSST2

+Copyright (c) 2014, Intel Corporation.
+All rights reserved.
+
+Redistribution.  Redistribution and use in binary form, without
+modification, are permitted provided that the following conditions are
+met:
+
+* Redistributions must reproduce the above copyright notice and the
+  following disclaimer in the documentation and/or other materials
+  provided with the distribution.
+* Neither the name of Intel Corporation nor the names of its suppliers
+  may be used to endorse or promote products derived from this software
+  without specific prior written permission.
+* No reverse engineering, decompilation, or disassembly of this software
+  is permitted.
+
+Limited patent license.  Intel Corporation grants a world-wide,
+royalty-free, non-exclusive license under patents it now or hereafter
+owns or controls to make, have made, use, import, offer to sell and
+sell ("Utilize") this software, but solely to the extent that any
+such patent is necessary to Utilize the software alone, or in
+combination with an operating system licensed under an approved Open
+Source license as listed by the Open Source Initiative at
+http://opensource.org/licenses.  The patent license shall not apply to
+any other combinations which include this software.  No hardware per
+se is licensed hereunder.
+
+DISCLAIMER.  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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+USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGE.

WHENCE

@@ -2628,3 +2628,11 @@ File: dvb-usb-it9135-02.fw
 Licence: Redistributable. See LICENCE.it913x for details
 
 --------------------------------------------------------------------------
+
+Driver: snd_soc_sst_acpi
+
+File: intel/IntcSST2.bin
+
+License: Redistributable. See LICENCE.IntcSST2 for details
+
+--------------------------------------------------------------------------