configs: turn on IEEE802154 and MRF24J40 for BeagleBone

Signed-off-by: Alan Ott <alan@signal11.us>
not-capebus: add updated support for MRF24J40 cape

Signed-off-by: Alan Ott <alan@signal11.us>
6lowpan: Updated 6lowpan patches

These patches represent what is currently in either mainline or net-next.
The patches that were in here before were an earlier version of an
out-of-tree patch set which has since been merged into net-next.

Signed-off-by: Alan Ott <alan@signal11.us>
3.8: limit LDO3 to 1.8V for beaglebone black (needs testing)

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>