cpu/lpc2387: purge FEUERWARE_CONF_CORE_SUPPORTS_TIME
board/avsextrem, cpu/lpc2387: purge FEUERWARE_CONF_CPU_NAME
cpu/arm_common: purge FEUERWARE_CONF_ENABLE_HAL
boards/avsextrem: purge FEUERWARE_CONF_SUPPORTS_FILES
boards/avsextrem: remove configure.h, it's unused