We will route backup through the BackupEncryption APK which will
implement an intermediate transport which will encrypt (or decrypt) the data when
sending it (receiving it) from the real transport.
Since both backup services and IntermediateTransport need to bind to
IBackupTransport, they both need the transport client code so we move that
into its own lib.
Bug: 139269919
Test: atest -v RunBackupFrameworksServicesRoboTests
Test: atest -v $(find frameworks/base/services/tests/servicestests/src/com/android/server/backup -name '\''*Test.java'\'')'
Test: atest -v CtsBackupTestCases CtsBackupHostTestCases
Change-Id: Id986162ac71adf8638e5797169ef70e0d3d58b0c
See build/soong/README.md for more information.
Test: m checkbuild
Exempt-From-Owner-Approval: trivial conversion
Change-Id: I417409281c928ea667d937090d2a0d9d72a449a2
