fix(log): Fix log time mismatch

When system startup, using 2*crystal as clock source.

components/log/include/esp_log.h

@@ -78,6 +78,16 @@ void esp_log_level_set(const char* tag, esp_log_level_t level);
  */
 putchar_like_t esp_log_set_putchar(putchar_like_t func);
 
+/**
+ * @brief Function which returns timestamp to be used in log output
+ *
+ * This function uses HW cycle counter and does not depend on OS,
+ * so it can be safely used after application crash.
+ *
+ * @return timestamp, in milliseconds
+ */
+uint32_t esp_log_early_timestamp(void);
+
 /**
  * @brief Write message into the log
  *