[Feature][ZXW-107] add libpoweralarm demo code

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

Change-Id: Iaf4f1e7a10055192d54aa96b9e9d10e6e93cee44
3 files changed