Only get ro.product.first_api_level for testFirstApiLevel am: 6e3f68aa48 am: 8679cefb4f

Original change: https://googleplex-android-review.googlesource.com/c/platform/test/vts-testcase/hal/+/12041866

Change-Id: I8a892ee6c705cdd1f8cd5fd3ffa2a78593772070