wfx: add antenna configuration files

The wfx driver is now able load the antenna parameters (aka PDS file)
corresponding to the board declared in the device tree.

So, add these files to linux-firmware.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -5845,8 +5845,18 @@ Driver: wfx - Silicon Labs Wi-Fi Transceiver
 File: wfx/wfm_wf200_C0.sec
 Version: 3.12.1
 
+File: wfx/brd4001a.pds not listed in WHENCE
+File: wfx/brd8022a.pds not listed in WHENCE
+File: wfx/brd8023a.pds not listed in WHENCE
+
 Licence: Redistributable. See wfx/LICENCE.wf200 for details.
-Originates from https://github.com/SiliconLabs/wfx-firmware
+
+The firmware itself originates from https://github.com/SiliconLabs/wfx-firmware
+
+The *.pds files come from https://github.com/SiliconLabs/wfx-pds
+
+They have been processed with the tool "pds_compress" available on
+https://github.com/SiliconLabs/wfx-linux-tools
 
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