fix(debug): don't initalise SP_AUX1 if not exist #4962
Merged
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Fixes #4958
Summary of changes:
#3814 implicitly exposed an assumption whereby AUX1 was being initialised for use for debugging when not available, and thus locking "Debug" out as an option for USB-VCP on radios with no available AUX1. Therefore, check if AUX_SERIAL is defined as well as DEBUG.