[Silabs][Test driver]Fix efr32 assert due to missing init

src/messaging/tests/BUILD.gn

@@ -49,13 +49,15 @@ static_library("helpers") {
 chip_test_suite_using_nltest("tests") {
   output_name = "libMessagingLayerTests"
 
-  test_sources = [ "TestExchange.cpp" ]
+  test_sources = []
 
   if (chip_device_platform != "efr32") {
     # TODO(#10447): ReliableMessage Test has HF, and ExchangeMgr hangs on EFR32.
     # And TestAbortExchangesForFabric does not link on EFR32 for some reason.
+    # TODO #33372: TestExchange.cpp asserts in ExchangeContext::SendMessage
     test_sources += [
       "TestAbortExchangesForFabric.cpp",
+      "TestExchange.cpp",
       "TestExchangeMgr.cpp",
       "TestReliableMessageProtocol.cpp",
     ]

src/platform/silabs/Logging.cpp

@@ -136,9 +136,10 @@ static void PrintLog(const char * msg)
 
 #if SILABS_LOG_OUT_UART
         uartLogWrite(msg, sz);
-#elif PW_RPC_ENABLED
-        PigweedLogger::putString(msg, sz);
 #else
+#if PW_RPC_ENABLED
+        PigweedLogger::putString(msg, sz);
+#endif // PW_RPC_ENABLED
         SEGGER_RTT_WriteNoLock(LOG_RTT_BUFFER_INDEX, msg, sz);
 #endif // SILABS_LOG_OUT_UART
 
@@ -147,9 +148,8 @@ static void PrintLog(const char * msg)
         sz                   = strlen(newline);
 #if PW_RPC_ENABLED
         PigweedLogger::putString(newline, sz);
-#else
-        SEGGER_RTT_WriteNoLock(LOG_RTT_BUFFER_INDEX, newline, sz);
 #endif // PW_RPC_ENABLED
+        SEGGER_RTT_WriteNoLock(LOG_RTT_BUFFER_INDEX, newline, sz);
 #endif
     }
 }

src/test_driver/efr32/src/main.cpp

@@ -33,6 +33,7 @@
 #include <platform/CHIPDeviceLayer.h>
 #include <platform/KeyValueStoreManager.h>
 #include <platform/silabs/platformAbstraction/SilabsPlatform.h>
+#include <sl_system_init.h>
 #include <sl_system_kernel.h>
 #include <task.h>
 
@@ -185,6 +186,7 @@ void RunRpcService(void *)
 
 int main(void)
 {
+    sl_system_init();
     chip::DeviceLayer::Silabs::GetPlatform().Init();
     PigweedLogger::init();
     mbedtls_platform_set_calloc_free(CHIPPlatformMemoryCalloc, CHIPPlatformMemoryFree);