llsec: Noncompromise-resilient 802.15.4 security
'free_packet' in csma.c conflicted with 'free_packet' in maca.c
sicslowpan: Fixed too aggresive fragmentation
CC2420: Doing CRC in hardware all the time
CC2420: Macros as functions for saving program memory
CC2420: CC2420_WRITE_RAM with parameterizable ordering + resulting
simplifications
CC2420: The crystal oscillator only needs to stabilize at startup
CC2420: The variable "pending" was never used
CC2420: Removed unused variables
CC2420: Eliminated duplicated code in cc2420_read
CC2420: Reusing getrxdata instead of getrxbyte.
CC2420: Hardware-accelerated llsec802154_aes_driver
CC2420: Turned SPI macros to functions and removed redundant AES API
CC2420: Added GET_LOCK/RELEASE_LOCK in aes/set_key