Add : Show "EnergySave" on Main Page

Found there is a private flag F_AllSxROn in GreenPwr.
Use this flag and SBV2_GreenPwrIsEnable to know if any SxR is offed by GreenPwr.

So create a function : int GreenPwr_InAction( ) to do this.

and in UI.C HomeDsp.

call this function to Show "System State" or "EnergySave".

**　there are only 10 chars left in this line.

2.3pr3