add psram check for RMII workaround

src/util/PSRAM.cpp

@@ -0,0 +1,12 @@
+#include "esp_psram.h"
+#include "esp32-hal.h"
+#include "PSRAM.h"
+
+const bool PSRAM::found(void)
+{
+#if CONFIG_IDF_TARGET_ESP32C2 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32C6 || DISABLE_PSRAMCHECK || CORE32SOLO1
+    return psramFound();
+#else
+    return psramFound() && esp_psram_is_initialized();
+#endif
+}

src/util/PSRAM.h

@@ -0,0 +1,11 @@
+#pragma once
+
+class PSRAM
+{
+    public:
+    // this function is a replacement for `psramFound()`.
+// `psramFound()` can return true even if no PSRAM is actually installed
+// This new version also checks `esp_spiram_is_initialized` to know if the PSRAM is initialized
+    static const bool found(void);
+
+};