As part of the effort to uprev libchrome in Android, we are
removing Android dependencies to libchrome utility functions
that are not strictly required.
This CL remove the usage of base::RandInt and replace by std cpp
Bug: 360917504
Change-Id: I83ea0f00ca07074f8c6c9a69db343a65cc8deb27
Test: atest libfs_avb_internal_test