Adding package caller to prepareForUnattendedReboot.

Bug: 192607493
Test: make, manual
Change-Id: Ie904f8f0ff18eb0d367297abebead3032d0eabec
Merged-In: Ie904f8f0ff18eb0d367297abebead3032d0eabec
Merged-In: I566a32237dcd00e63d24619a403b9a14f7c85925
1 file changed