drivers: wifi: siwx91x: Extract AP related functions

siwx91x_wifi.c starts to contains to much code. Let' simplify it by
grouping all the Access Point related functions in a separated file.

Signed-off-by: Jérôme Pouiller <[email protected]>

Author: jerome-pouiller

drivers/wifi/siwx91x/CMakeLists.txt

@@ -2,7 +2,7 @@
 # Copyright (c) 2024 Silicon Laboratories Inc.
 
 if(CONFIG_WIFI_SILABS_SIWX91X)
-  zephyr_library_sources(siwx91x_wifi.c siwx91x_wifi_scan.c)
+  zephyr_library_sources(siwx91x_wifi.c siwx91x_wifi_ap.c siwx91x_wifi_scan.c)
 
   if(CONFIG_WIFI_SILABS_SIWX91X_NET_STACK_OFFLOAD)
     zephyr_library_sources(siwx91x_wifi_socket.c)