Add RADIOLIB_EXCLUDE_LR2021 in places that excluded LR11x0 (#10112)

To save resources, some devices where LR11x0 was never an option
excluded it from compilation, using RADIOLIB_EXCLUDE_LR11X0 .

As we will soon have LR2021 support, apply the same treatment
to that chip to these devices, by adding RADIOLIB_EXCLUDE_LR2021

variants/esp32/heltec_wireless_bridge/platformio.ini

@@ -10,6 +10,7 @@ build_flags =
   -D BOARD_HAS_PSRAM
   -D RADIOLIB_EXCLUDE_LR11X0=1
   -D RADIOLIB_EXCLUDE_SX128X=1
+  -D RADIOLIB_EXCLUDE_LR2021=1
   -D MESHTASTIC_EXCLUDE_CANNEDMESSAGES=1
   -D MESHTASTIC_EXCLUDE_DETECTIONSENSOR=1
   -D MESHTASTIC_EXCLUDE_ENVIRONMENTAL_SENSOR=1