Radio board assumes how many boards there are in the rocket

[akmorrison]

Radio board assumes that there are no more than 0x0E boards in the rocket, because that's the maximum from IREC 2019. The definition is here:

cansw_radio/sotscon.c

Line 15 in 32596bd

#define MAX_BOARD_UNIQUE_ID 0x0E

Ideally, that macro should be sourced from message_types.h, since that's where the board ID's are tracked and it knows what the maximum number is.

If we don't move this macro, or at least increment it for remote arming/fill sensing, radio board will report an ILLEGAL_CAN_MSG error every time it receives a message from them, which'll be often