intel: avs: Add AudioDSP base firmware for SKL-based platforms

Provide the base firmware for the skylake- and avs- drivers to utilize.
This is an updated version of existing intel/dsp_fw_release.bin and
intel/dsp_fw_kbl.bin.

Leave links for backward compatibility but put the binaries into a
dedicated folder so it is clear which driver makes use of them.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>

WHENCE

@@ -4053,6 +4053,18 @@ License: Redistributable. See LICENCE.IntcSST2 for details
 
 --------------------------------------------------------------------------
 
+Driver: snd_soc_avs -- Intel AudioDSP driver for cAVS platforms
+
+File: intel/avs/skl/dsp_basefw.bin
+File: intel/avs/skl/dsp_mod_7CAD0808-AB10-CD23-EF45-12AB34CD56EF.bin
+Version: 9.21.00.4899
+Link: intel/dsp_fw_release.bin -> intel/avs/skl/dsp_basefw.bin
+Link: intel/dsp_fw_kbl.bin -> intel/avs/skl/dsp_basefw.bin
+
+License: Redistributable. See LICENCE.adsp_sst for details
+
+--------------------------------------------------------------------------
+
 Driver: snd_intel_sst_core
 
 File: intel/fw_sst_0f28.bin
@@ -4077,7 +4089,6 @@ File: intel/dsp_fw_release_v969.bin
 Version: 8.20.00.969
 File: intel/dsp_fw_release_v3402.bin
 Version: 9.21.00.3402_161
-Link: intel/dsp_fw_release.bin -> dsp_fw_release_v3402.bin
 
 License: Redistributable. See LICENCE.adsp_sst for details
 
@@ -4103,7 +4114,6 @@ File: intel/dsp_fw_kbl_v3420.bin
 Version: 9.21.00.3420_163
 File: intel/dsp_fw_kbl_v3402.bin
 Version: 9.21.00.3402_161
-Link: intel/dsp_fw_kbl.bin -> dsp_fw_kbl_v3402.bin
 
 License: Redistributable. See LICENCE.adsp_sst for details