wfx: update to firmware 3.14

The firmware 3.14 has been released the 2022-01-26.

Here the last modifications (only modifications tagged [LMAC] have an
impact on Linux):

    * [1792] - [UMAC] Fix an issue causing the softAP mode to forward
                      unencrypted data frames
    * [1794] - [UMAC] Fix a connection timeout while connecting to an AP
                      with a hidden SSID
    * [1724] - [UMAC] Add an API to select the rate algorithm to use
    * [1757] - [UMAC] Handle invalid size parameters in
                      sl_wfx_send_scan_command()
    * [1767] - [LMAC] Prevent defragmentation from accepting mixed
                      encrypted/plaintext fragments
    * [1768] - [LMAC] Prevent defragmentation from accepting
                      non-consecutive packet numbers for fragments
    * [1769] - [LMAC] Prevent defragmentation from accepting fragments
                      encrypted with different keys
    * [1770] - [LMAC] Clear defragmentation cache upon reconnection
    * [1731] - [LMAC] Fix an issue in concurrent mode where packets were
                      passed to the wrong interface
    * [1745] - [LMAC] Fix an issue with specific information elements
                      handling leading to a firmware exception
    * [1751] - [UMAC] Configured CCA mode is not overwritten anymore
                      when starting an interface

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

WHENCE

@@ -5843,7 +5843,7 @@ License: Redistributable. See LICENSE.Lontium for details.
 Driver: wfx - Silicon Labs Wi-Fi Transceiver
 
 File: wfx/wfm_wf200_C0.sec
-Version: 3.12.1
+Version: 3.14
 
 File: wfx/brd4001a.pds not listed in WHENCE
 File: wfx/brd8022a.pds not listed in WHENCE