Reformat some code

reorganize debug comments
cleanup pending status at boot

implement get_chip_status and use it to detect command errors

add fifo read and write commands
add comments, add a function to set a single byte property
add bits for global config property and fast response register options

wireless/ieee802154: MRF24J40: Finishes receive functionality, supports promicuous mode, and rxonidle attributes

wireless/ieee802154: Reworks data_ind allocation to include IOB allocation/deallocation. Hides private data.

Also reformat some long lines.

wireless/ieee802154: Removes radio IOCTL.  Starts bringing radio and MAC closer with well-defined interface.

also fix upper half ioctl

wireless/ieee802154: Changes transmit data path to use IOBs and exposes function for getting size of MAC header