Merge branch 'feature/add_get_freertos_rate_hz' into 'master'

Add port to get freertos rate hz

See merge request sdk/ESP8266_RTOS_SDK!431

components/freertos/port/esp8266/include/freertos/portmacro.h

@@ -233,6 +233,9 @@ void esp_mem_trace(const void *ptr, const char *trace, int no);
  */
 bool interrupt_is_disable(void);
 
+/* Get tick rate per second */
+uint32_t xPortGetTickRateHz(void);
+
 #ifdef __cplusplus
 }
 #endif

components/freertos/port/esp8266/port.c

@@ -395,3 +395,8 @@ void vApplicationIdleHook(void)
     pmIdleHook();
     esp_task_wdt_reset();
 }
+
+uint32_t xPortGetTickRateHz(void)
+{
+    return (uint32_t)configTICK_RATE_HZ;
+}