fix(startup): move rtc initialization before MSPI timing tuning to improve stability

components/esp_system/port/include/esp_clk_internal.h

@@ -18,6 +18,15 @@ extern "C" {
  * Private clock-related functions
  */
 
+/**
+ * @brief Initialize rtc-related settings
+ *
+ * Called from cpu_start.c, not intended to be called from other places.
+ * This function configures the power related stuff.
+ * After this the MSPI timing tuning can be done.
+ */
+void esp_rtc_init(void);
+
 /**
  * @brief Initialize clock-related settings
  *