[Bugfix][bug-view-256]Resolve the issue of differential package downgrade failure

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: I0105c7470416e8895ccd709bb0941c60f6670c19
2 files changed