Bridge MAC learning & forwarding update - 2: adding HAL support

Added #HAL support in #bridge #transparent #port update handler in ethernet module. The new HAL calls will #enable #port #level #MAC #learning & #forwarding separately in #hardware #data-plane.

#Ethernet update 107 ...
[commit 7b5b4358d42edc7c132afd6a2334ca2a196a06ef]