Merge pull request #6344 from haukepetersen/opt_pm_misc

boards/chronos/Makefile.include

cpu/arm7_common/Makefile

cpu/arm7_common/Makefile.include

cpu/arm7_common/arm_cpu.c

cpu/arm7_common/periph/Makefile

cpu/arm7_common/periph/pm.c

cpu/cc430/Makefile.include

cpu/cortexm_common/Makefile

cpu/cortexm_common/Makefile.include

cpu/cortexm_common/panic.c

cpu/cortexm_common/periph/Makefile

cpu/cortexm_common/periph/pm.c

cpu/lpc1768/Makefile.include

cpu/msp430_common/Makefile

cpu/msp430_common/Makefile.include

cpu/msp430_common/cpu.c

cpu/msp430_common/periph/Makefile

cpu/msp430_common/periph/pm.c

drivers/include/periph/pm.h

sys/include/pm_layered.h