boards: remove all C++ comments

boards/avsextrem/include/smb380-board.h

boards/avsextrem/include/ssp0-board.h

boards/msb-430/include/board.h

boards/msba2-common/drivers/include/sht11-board.h

boards/msba2-common/include/msba2_common.h

boards/msba2-common/tools/src/chipinfo.h

boards/msba2-common/tools/src/control_2xxx.h

boards/msba2-common/tools/src/lpc2k_pgm.h

boards/msba2-common/tools/src/serial.h

boards/redbee-econotag/drivers/include/nvm.h

boards/redbee-econotag/include/board.h

boards/telosb/include/board.h

boards/wsn430-v1_4/include/board.h

boards/z1/include/board.h