Set DMA alignment constraint of status, TX and RX LEs(List Elements
in Marvell terms) to 32768. 32768 looks overkill but it will
ensure correct DMAed update. This change addresses occasional
watchdog timeouts reported on 10.2-RELEASE.

Tested by: Johann Hugo <jhugo@meraka.csir.co.za>
MFC after: 2 weeks