firmware: add firmware version/serial number functions

Signed-off-by: Jeppe Ledet-Pedersen <jlp@satlab.org>
firmware: lower sync word error tolerance to 1 bit error

Signed-off-by: Jeppe Ledet-Pedersen <jlp@satlab.org>
bbctl: add firmware version and serial number commands

Signed-off-by: Jeppe Ledet-Pedersen <jlp@satlab.org>