drivers/at86rf231: fix two cppcheck findings
Merge pull request #1920 from thomaseichinger/at86_fix

drivers/at86rf231: fix two cppcheck findings
drivers - netdev: extend netdev_state_t enum
drivers - cc110x: Initial import of new cc110x driver
boards - msbiot: prepare msbiot for new cc110x driver
cpu - stm32f4: define necessary buffer sizes
support new cc110x driver globally
sys - transceiver: make transceiver ready for new cc110x driver