[Feature][T106][task-view-276]move the fota backup code from source to src

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

Change-Id: I95705225076d537caff5406926c6787fe42ef758
6 files changed