Run abandon() in the system server context

abandon() will call into StagingManager which might
trigger external callbacks. The code should not
run in the context of the calling uid.

Bug: 267383992
Test: CtsStagedInstallHostTestCases
Change-Id: Ib8a1b6bd48388e1dc2362b8f7cbe4c0d41ee3ebc
1 file changed