[Bugfix][API-1415] merge MTK hwnat patch

Only Configure: No
Affected branch: GSW3.0-No-Connman
Affected module: ethernet
Is it affected on both ZXIC and MTK: only MTK
Self-test: No
Doc Update: No

Change-Id: Ifda159aed9c922e459442d341dd6ccfe41cbafbf
9 files changed