lfs: Drop support for prebuilts < Android 9

Summary

This MR resolves the linked issue

Issue(s)

• https://gitlab.e.foundation/e/os/backlog/-/issues/214

Technical specifications

None available

Screenshots

None available

Validation

• Ensure only packages related to android versions < Android 9 have been dropped
• Ensure this repository is not even tracked or built on any android versions < Android 9