Fixing problem where k_fifo functions have been used to get/put
data from/info net buf, where documentation has been strictly
forbidding so.
Found, reported and solution suggested by jrhees-cae.
Fixes: #32579
Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
In order to be able to add more entries under 'subsys/mgmt', move the
current contents of it, which relate exclusively to MCUMgr, to its own
folder.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
