linux-firmware: add sst audio firmware for braswell platforms

This adds the fw_sst_22a8.bin binary for the Intel Braswell platforms
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Kyle McMartin <kyle@kernel.org>

WHENCE

@@ -2660,6 +2660,14 @@ License: Redistributable. See LICENCE.fw_sst_0f28 for details
 
 --------------------------------------------------------------------------
 
+Driver: snd_intel_sst_core
+
+File: intel/fw_sst_22a8.bin
+
+License: Redistributable. See LICENCE.fw_sst_0f28 for details
+
+--------------------------------------------------------------------------
+
 Driver smsmdtv - Siano MDTV Core module
 
 File: cmmb_vega_12mhz.inp