ll: Use adv_type_t instead of local representation
radio: Add radio_set_tx_power() API
nrf51822: Implement radio_set_tx_power()
build: Add bci.c to Makefile.common
bci: Change bci_init() signature
bci: Implement bci_init()
bci: Add bci_set_advertising_data() API
bci: Add bci_set_advertise_enable() API