Add API to feed the loop WDT (call from loop only)

cores/esp32/esp32-hal-cpu.c

@@ -131,10 +131,8 @@ bool setCpuFrequencyMhz(uint32_t cpu_freq_mhz){
     uint32_t capb, apb;
     //Get XTAL Frequency and calculate min CPU MHz
     rtc_xtal_freq_t xtal = rtc_clk_xtal_freq_get();
-    uint32_t min_cpu_mhz = 10;
     if(xtal > RTC_XTAL_FREQ_AUTO){
         if(xtal < RTC_XTAL_FREQ_40M) {
-            min_cpu_mhz = xtal / 2; //13Mhz for 26Mhz XTAL
             if(cpu_freq_mhz <= xtal && cpu_freq_mhz != xtal && cpu_freq_mhz != (xtal/2)){
                 log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2);
                 return false;

cores/esp32/esp32-hal-misc.c

@@ -69,6 +69,13 @@ void disableLoopWDT(){
         }
     }
 }
+
+void feedLoopWDT(){
+    esp_err_t err = esp_task_wdt_reset();
+    if(err != ESP_OK){
+        log_e("Failed to feed WDT! Error: %d", err);
+    }
+}
 #endif
 
 void enableCore0WDT(){

cores/esp32/esp32-hal.h

@@ -77,6 +77,8 @@ float temperatureRead();
 //enable/disable WDT for Arduino's setup and loop functions
 void enableLoopWDT();
 void disableLoopWDT();
+//feed WDT for the loop task
+void feedLoopWDT();
 #endif
 
 //enable/disable WDT for the IDLE task on Core 0 (SYSTEM)