making include directives consistent

boards/avsextrem/drivers/avsextrem-cc1100.c

boards/avsextrem/drivers/avsextrem-smb380.c

boards/avsextrem/include/board.h

boards/avsextrem/include/smb380-board.h

boards/chronos/board_init.c

boards/chronos/drivers/battery.c

boards/chronos/drivers/buzzer.c

boards/chronos/drivers/cc430-cc110x.c

boards/chronos/drivers/display.c

boards/chronos/drivers/display1.c

boards/chronos/drivers/display_putchar.c

boards/msb-430-common/board_config.c

boards/msb-430-common/drivers/include/sht11-board.h

boards/msb-430-common/uart1.c

boards/msb-430h/driver_cc110x.c

boards/msba2-common/board_common_init.c

boards/msba2-common/board_config.c

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

boards/msba2-common/drivers/msba2-cc110x.c

boards/msba2-common/drivers/msba2-uart0.c