Use mt76_alloc_device utility routine for mt76x0_dev/mt76_dev
allocation
Signed-off-by: NLorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: NStanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: NFelix Fietkau <nbd@nbd.name>