linux-firmware: intel: Update Broxton audio firmware

This updates Broxton audio dsp firmware, this version contains
some odd update and is signed with production keys

The version of this firmware release is 9.00.00.702

The md5sum of this firmware binary is 15cf66d804f8d275a607108bb4b57c42
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

WHENCE

@@ -3012,8 +3012,8 @@ md5sum: 472607996014603dca939877bf085d48
 License: Redistributable. See LICENCE.adsp_sst for details
 
 File: intel/dsp_fw_bxt.bin
-Version: 9.00.00.430
-md5sum: a307e8a10045ce78e0744d7479c715a7
+Version: 9.00.00.702
+md5sum: 15cf66d804f8d275a607108bb4b57c42
 
 License: Redistributable. See LICENCE.adsp_sst for details
 

intel/dsp_fw_bxtn.bin

-dsp_fw_bxtn_v430.bin
\ No newline at end of file
+dsp_fw_bxtn_v702.bin
\ No newline at end of file