Adds GetSupportedWiFiBandsMask API

Author: brosahay

src/platform/silabs/NetworkCommissioningWiFiDriver.cpp

@@ -258,6 +258,11 @@ chip::BitFlags<WiFiSecurity> SlWiFiDriver::ConvertSecuritytype(wfx_sec_t securit
     return securityType;
 }
 
+uint32_t SlWiFiDriver::GetSupportedWiFiBandsMask() const
+{
+    return WifiInterface::GetInstance()._GetSupportedWiFiBandsMask();
+}
+
 bool SlWiFiDriver::StartScanWiFiNetworks(ByteSpan ssid)
 {
     ChipLogProgress(DeviceLayer, "Start Scan WiFi Networks");

src/platform/silabs/NetworkCommissioningWiFiDriver.h

@@ -123,6 +123,7 @@ class SlWiFiDriver final : public WiFiDriver
     CHIP_ERROR ConnectWiFiNetwork(const char * ssid, uint8_t ssidLen, const char * key, uint8_t keyLen);
 
     chip::BitFlags<WiFiSecurity> ConvertSecuritytype(wfx_sec_t security);
+    uint32_t GetSupportedWiFiBandsMask() const override;
 
     void OnConnectWiFiNetwork();
     void UpdateNetworkingStatus();

src/platform/silabs/wifi/BUILD.gn

@@ -113,6 +113,7 @@ source_set("wifi-platform") {
     "${chip_root}/src/app/icd/server:icd-server-config",
     "${chip_root}/src/inet",
     "${chip_root}/src/lib/support",
+    "${chip_root}/src/platform:platform_base",
   ]
 
   if (use_rs9116) {

src/platform/silabs/wifi/WifiInterface.h

@@ -16,7 +16,9 @@
  */
 #pragma once
 
+#include <app-common/zap-generated/cluster-enums.h>
 #include <app/icd/server/ICDServerConfig.h>
+
 #include <array>
 #include <cmsis_os2.h>
 #include <lib/support/BitFlags.h>
@@ -410,6 +412,20 @@ class WifiInterface
      */
     virtual void CancelScanNetworks() = 0;
 
+    using WiFiBandEnum = app::Clusters::NetworkCommissioning::WiFiBandEnum;
+    /**
+     *  @brief Provide all the frequency bands supported by the Wi-Fi interface.
+     *
+     *  The default implementation returns the 2.4 GHz band support.
+     *
+     *  @return a bitmask of supported Wi-Fi bands where each bit is associated with a WiFiBandEnum value.
+     */
+    virtual uint32_t _GetSupportedWiFiBandsMask() const
+    {
+        // Default to 2.4G support only
+        return static_cast<uint32_t>(1UL << chip::to_underlying(WiFiBandEnum::k2g4));
+    }
+
 protected:
     /**
      * @brief Function notifies the PlatformManager that an IPv6 event occured on the WiFi interface.