[Tizen] Call mDNS resolve callback under stack lock (#19947)

Changes in dc3862a has uncovered potential race condition in Tizen mDNS
resolver. The callback function was called outside of the Matter stack
lock. This callback might perform PASE session paring which involves
message exchanges, which requires locking. Simple fix for that is to
call the callback under the lock.

src/platform/Tizen/DnssdImpl.cpp

@@ -340,7 +340,12 @@ void OnResolve(dnssd_error_e result, dnssd_service_h service, void * data)
     dnssdService.mTextEntries   = textEntries.empty() ? nullptr : textEntries.data();
     dnssdService.mTextEntrySize = textEntries.size();
 
-    rCtx->mCallback(rCtx->mCbContext, &dnssdService, chip::Span<chip::Inet::IPAddress>(&ipAddr, 1), CHIP_NO_ERROR);
+    { // Lock the stack mutex when calling the callback function, so that the callback
+      // function could safely perform message exchange (e.g. PASE session pairing).
+        chip::DeviceLayer::StackLock lock;
+        rCtx->mCallback(rCtx->mCbContext, &dnssdService, chip::Span<chip::Inet::IPAddress>(&ipAddr, 1), CHIP_NO_ERROR);
+    }
+
     rCtx->mInstance->RemoveContext(rCtx);
     return;