Boot Stop @ Start CH376

[utw3v0]

there is an issue when the ch376 module is defined, on serial monitor it stops @ Start CH376 because "pin_ch376_cs" and "pin_ch376_int" are not defined so they have to be set first.

There are 3 ways to do so ....

1. in tools -> radio_init
2. in defaultprefs.h
3. hardcoded in main.cpp