Fix #if chain and added AVR32 case in cmd_bdinfo.c

AVR32 case was missing in cmd_bdinfo, resulting in compiler warning
(bd->bi_baudrate declared unsigned int at AVR32, but printf used %d)

At the same time slightly reordered #if #elif #endif to make ARM one
of the cases and not an extra case surrounding all others

Signed-off-by: Reinhard Meyer <info@emk-elektronik.de>
Tested-by: Andreas Bießmann <biessmann@corscience.de>