[SL-ONLY] Compilation errors fixed: Unused variables. (#1207)

[SL_TEMP] Compilation errors fixed: Unused variables.

Author: rcasallas-silabs

examples/platform/silabs/BaseApplication.cpp

@@ -175,7 +175,9 @@ bool sHaveBLEConnections = false;
 
 constexpr uint32_t kLightTimerPeriod = static_cast<uint32_t>(pdMS_TO_TICKS(10));
 
+#if SL_MATTER_ZIGBEE_SEQUENTIAL
 constexpr System::Clock::Milliseconds32 kZbLeaveAnnouceDelay = System::Clock::Milliseconds32(1000);
+#endif
 
 uint8_t sAppEventQueueBuffer[APP_EVENT_QUEUE_SIZE * sizeof(AppEvent)];
 osMessageQueue_t sAppEventQueueStruct;
@@ -210,7 +212,7 @@ ObjectPool<Identify,
 
 int sCodeDrivenIdentifyActiveCount                                 = 0;
 Clusters::Identify::EffectIdentifierEnum sCodeDrivenIdentifyEffect = Clusters::Identify::EffectIdentifierEnum::kStopEffect;
-Clusters::Identify::EffectVariantEnum sCodeDrivenIdentifyVariant   = Clusters::Identify::EffectVariantEnum::kDefault;
+[[maybe_unused]] Clusters::Identify::EffectVariantEnum sCodeDrivenIdentifyVariant   = Clusters::Identify::EffectVariantEnum::kDefault;
 
 // Protects the three sCodeDrivenIdentify* variables above.
 osSemaphoreId_t sCodeDrivenIdentifyLock = nullptr;

src/platform/silabs/BLEManagerImpl.h

@@ -252,9 +252,9 @@ class BLEManagerImpl final : public BLEManager, private BleLayer, private BlePla
     PacketBufferHandle c3AdditionalDataBufferHandle;
 #endif
 
-#if !(defined(SLI_SI91X_ENABLE_BLE) && SLI_SI91X_ENABLE_BLE)
+#if defined(SL_BLE_SIDE_CHANNEL_ENABLED) && SL_BLE_SIDE_CHANNEL_ENABLED
     BLEChannel * mBleSideChannel = nullptr;
-#endif // !(defined(SLI_SI91X_ENABLE_BLE) && SLI_SI91X_ENABLE_BLE)
+#endif
 
     CHIP_ERROR MapBLEError(int bleErr);
     void DriveBLEState(void);