mac802154: use driver-ops function wrappers

This patch replaces all directly called driver ops by previous
introduced driver-ops function wrappers.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --cc net/mac802154/iface.c
Simple merge

diff --cc net/mac802154/main.c
Simple merge

diff --cc net/mac802154/mib.c
Simple merge

diff --cc net/mac802154/tx.c
Simple merge