Fix logger uart conflict check (#858)

* Fix logger uart conflict check

* Fix class for check func

* Fix syntax

Hope lint is OK with moving the end of the conditional outside the #IFDEF

* Move end of conditional inside ifdef and remove extra whitespace

* Simplify

clang-format did not like the ifdefs and was reformatting in a way that killed clang-tidy.

Simple solution is to use logger's hw_serial as source of truth

Also simplifies the code - uart doesn't need to know what the logger uart settings mean

esphome/components/logger/logger.h

@@ -32,6 +32,7 @@ class Logger : public Component {
   /// Manually set the baud rate for serial, set to 0 to disable.
   void set_baud_rate(uint32_t baud_rate);
   uint32_t get_baud_rate() const { return baud_rate_; }
+  HardwareSerial *get_hw_serial() const { return hw_serial_; }
 
   /// Get the UART used by the logger.
   UARTSelection get_uart() const;