[Feature][ZXW-185][POWER]add gmac power off instructions

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

Change-Id: I0d7a5e8492746ca9496ca29d6a8de4a667979d0b
1 file changed