[Feature][T8TSK-289] add support for sgmii1

Only Configure: No
Affected branch: MR3.0-Merge-v2.0-L805
Affected module: kernal
Is it affected on both ZXIC and MTK: only MTK
Self-test: Yes
Doc Update: No

Change-Id: I5843ff1ac449638ed7f5e66302f591eb82b6339f
3 files changed