bootloader: Boost bootloader CPU to 80MHz

Partially needed to use RNG, also useful to improve boot performance.

components/esp32/system_api.c

@@ -29,6 +29,7 @@
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
 #include "freertos/xtensa_api.h"
+#include "rtc.h"
 
 static const char* TAG = "system_api";
 
@@ -119,6 +120,9 @@ void IRAM_ATTR esp_restart(void)
             DPORT_TIMERS_RST | DPORT_SPI_RST_1 | DPORT_UART_RST);
     REG_WRITE(DPORT_PERIP_RST_EN_REG, 0);
 
+    // Set CPU back to XTAL source, no PLL, same as hard reset
+    rtc_set_cpu_freq(CPU_XTAL);
+
     // Reset CPUs
     if (core_id == 0) {
         // Running on PRO CPU: APP CPU is stalled. Can reset both CPUs.