Otherwise when other modules use the apex as data (for example, in
tests) they get the full path from the root of the workspace to the
apex.
Fixes: 276416485
Test: atest timezone_data_e2e_tests:com.android.tests.apex.TimezoneDataHostTest#testStageActivateUninstallApexPackage -- --abi x86_64 then tree out/host/linux-x86/testcases/timezone_data_e2e_tests
Change-Id: Id740856794770df2edc55dfff5f6f938fc31d0c5