[Bugfix][API-1313]after flash_erase system_a, can't startup

Only Configure: No
Affected branch: MR3.0-merged
Affected module: ab backup
Is it affected on both ZXIC and MTK: only MTK
Self-test: Yes
Doc Update: No

Change-Id: I8d52b2e82f239de34c90bed1a26525bd30e95ebb
(cherry picked from commit 1d74df46ce16aa6a283b775a88f543507ef11734)
1 file changed