linux-firmware: intel: Update Kabylake audio firmware

This updates Kabylake audio dsp firmware to latest version. The version
of this firmware release is 9.21.00.3420_163.

The md5sum of this firmware binary is 09eac60c5ef1e0ee94004811296eaca5.
Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com>

WHENCE

@@ -3298,7 +3298,9 @@ File: intel/dsp_fw_kbl_v2630.bin
 Version: 9.21.00.2630_97
 File: intel/dsp_fw_kbl_v3266.bin
 Version: 9.21.00.3266_144
-Link: intel/dsp_fw_kbl.bin -> dsp_fw_kbl_v3266.bin
+File: intel/dsp_fw_kbl_v3420.bin
+Version: 9.21.00.3420_163
+Link: intel/dsp_fw_kbl.bin -> dsp_fw_kbl_v3420.bin
 
 License: Redistributable. See LICENCE.adsp_sst for details
 

intel/dsp_fw_kbl.bin

-dsp_fw_kbl_v3266.bin
\ No newline at end of file
+dsp_fw_kbl_v3420.bin
\ No newline at end of file