[CTS] Don't run backup test cases on multi-abi

We don't depend on native code so we don't need to run on multi-abi

Bug: 123560150
Bug: 123364585
Bug: 123364781
Test: atest CtsBackupHostTestCases; atest CtsBackupTestCases
Change-Id: Idaa29c5d2fab0d0f85bfd7103f93541debdb291a
2 files changed