Increase lzma encoder chunk size to 4k

Change-Id: I61621fe92abf19967d46b7078051306073c64628
diff --git a/aos/events/logging/lzma_encoder.h b/aos/events/logging/lzma_encoder.h
index 1b6a0fe..919f5fa 100644
--- a/aos/events/logging/lzma_encoder.h
+++ b/aos/events/logging/lzma_encoder.h
@@ -32,7 +32,7 @@
   size_t queue_size() const final { return queue_.size(); }
 
  private:
-  static constexpr size_t kEncodedBufferSizeBytes{1024};
+  static constexpr size_t kEncodedBufferSizeBytes{4096};
 
   void RunLzmaCode(lzma_action action);