Add support for a hardware bind plug (PB5 pin 41) and alternative

default settings for AlienWii32 (8 brushed ESC) based on the NAZE
target.
I can do so and move this the boards.h file. If we rely go for a new target this will require many more code changes (also make process) and all parameters need to be set individually for each of the 3 exiting targets (would be 4 thereafter). The OLIMEXINIO target is not building since a while. What about having a separate section in boards.h which can handle different default settings. Since the AlienWii32 should use the NAZE code as much as possible I thought a simple define would make more sense than a complete separate target. Looking for your advice here.