Fix compilation issues with Arduino IDE

* Fix various compile errors / warnings when using Arduino 2.0 IDE (it compiles to a strict standard and errors out with unused variables etc.)
* Fix issue with compiling for ESP32-S2 using Arduino IDE

src/ESP32-HUB75-MatrixPanel-I2S-DMA.cpp

@@ -6,7 +6,11 @@
  #include "rom/cache.h"
 #endif 
 
-static const char* TAG = "MatrixPanel";
+extern Bus_Parallel16 dma_bus;
+
+#if CORE_DEBUG_LEVEL > 0
+ static const char* TAG = "MatrixPanel";
+#endif 
 
 /* This replicates same function in rowBitStruct, but due to induced inlining it might be MUCH faster 
  * when used in tight loops while method from struct could be flushed out of instruction cache between 
@@ -256,7 +260,7 @@ void MatrixPanel_I2S_DMA::configureDMA(const HUB75_I2S_CFG& _cfg)
  bus_cfg.pin_d15 = -1;
 
  #if defined(SPIRAM_DMA_BUFFER) 
- bus_cfg.psram_clk_hack = true;
+ bus_cfg.psram_clk_override = true;
  #endif
 
  dma_bus.config(bus_cfg);