[Feature][ZXW-220][POWER]add gmac power off to sleep AT

Only Configure: No
Affected branch: master
Affected module: autosuspend
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: Yes
Doc Update: NO

Change-Id: I84a863d3fcaa1c5df17545efc2d24e50721c713f
1 file changed