[Silabs] WiFi- Addressed build failures with wiseMCU package v1.0.1.4 (…

…#26161)

* Adds declarations for 917SoC which causing the build failure with 1.0.1.4 WisemcuSDK

* removed a macro redefinition

* adding warnings flags back, which removed for 1.0.18 package

examples/platform/silabs/SiWx917/LEDWidget.h

@@ -19,9 +19,11 @@
 
 #pragma once
 
-#include "rsi_board.h"
 #include <stdint.h>
 
+extern "C" void RSI_Board_LED_Set(int, int);
+extern "C" void RSI_Board_LED_Toggle(int);
+
 class LEDWidget
 {
 public:

third_party/silabs/SiWx917_sdk.gni

@@ -128,7 +128,6 @@ template("siwx917_sdk") {
         "LWIP_ICMP=1",
         "LWIP_IGMP=1",
         "LWIP_DHCP=1",
-        "LWIP_DNS=0",
       ]
     } else {
       defines += [ "LWIP_IPV4=0" ]
@@ -181,7 +180,14 @@ template("siwx917_sdk") {
     cflags += [
       "-Wno-maybe-uninitialized",
       "-Wno-shadow",
+      "-Wno-empty-body",
+      "-Wno-cpp",
+      "-Wno-missing-braces",
+      "-Wno-sign-compare",
       "-Wno-error",
+      "-Wno-unknown-warning-option",
+      "-Wno-unused-variable",
+      "-Wno-unused-function",
     ]
 
     if (defined(invoker.defines)) {