Sets correct code for UART baud rate detection

[SuGlider]

Description of Change

Excludes ESP32S3 and ESP32C3 in the UART HAL code that detects baud rate.
This feature only works for ESP32 and ESP32S2

Tests scenarios

ESP32, ESP32S2 and ESP32S3.

// This sketch works correctly with ESP32 and ESP32S2 only, so far.
// ESP32C3 and ESP32S3 seems to fail with baud rate detection
void setup() {
  Serial.begin(115200);
  Serial.println("\nTesting baud rate detection\n");
}

void loop() {
  Serial.println("Started detection for next 20 seconds.");
  Serial.println("Use the Serial Monitor. Change the baud rate in the botton of the window.");
  Serial.println("Send characters using the Serial Monitor and get the detected baud rate.");
  Serial.flush();

  Serial.begin(0);
  unsigned long detectedBaudRate = Serial.baudRate();

  if (detectedBaudRate) {
    Serial.printf("\nDetected baudrate is %lu\n\n", detectedBaudRate);
  } else {
    // this may not display correctly in the Serial Monitor, given that it failed.
    Serial.println("\nNo baudrate detected, Serial will not work!\n\n");
  }
}

Related links

Closes #7882
Closes #7718

[VojtechBartoska]

Status update:

• works for ESP32 & ESP32-S2

One issue tagged in description doesn't exist.