HAL and serial cleanup

Co-Authored-By: Jason Smith <20053467+sjasonsmith@users.noreply.github.com>

Marlin/src/HAL/ESP32/HAL.h

@@ -58,9 +58,6 @@ extern portMUX_TYPE spinlock;
   #else
     #define MYSERIAL1 webSocketSerial
   #endif
-  #define NUM_SERIAL 2
-#else
-  #define NUM_SERIAL 1
 #endif
 
 #define CRITICAL_SECTION_START() portENTER_CRITICAL(&spinlock)