fix(wb55): remove useless define ARDUINO_PNUCLEO_WB55RG

Author: nedseb

variants/STM32WBxx/WB55R(C-E-G)V/variant_P_NUCLEO_WB55RG.h

@@ -156,4 +156,4 @@
   //                            pins are NOT connected to anything by default.
   #define SERIAL_PORT_MONITOR   Serial
   #define SERIAL_PORT_HARDWARE  Serial1
-#endif
+#endif

variants/STM32WBxx/WB55R(C-E-G)V/variant_STEAM32_WB55RG.h

@@ -67,6 +67,7 @@
 #define NUM_DIGITAL_PINS  44
 #define NUM_ANALOG_INPUTS 6
 
+// Not used by Arduino only here for documentation purpose
 // Upper pad
 #define GPIO1 44 // P28
 #define GPIO2 45 // P29
@@ -207,9 +208,6 @@
   #define HAL_QSPI_MODULE_ENABLED
 #endif
 
-/* backward compatibility */
-#define ARDUINO_PNUCLEO_WB55RG
-
 /*----------------------------------------------------------------------------
  *        Arduino objects - C++ only
  *----------------------------------------------------------------------------*/