Revert "Use boot image extension for framework libraries."

This reverts commit 4d2eeed0.

Reason for revert: breaks avd/avd_boot_health_check test
  on cf_x86_phone-userdebug_coverage on branch rvc-release
  (the device fails to boot).

Test: m
Test: aosp_walleye-userdebug boots

Bug: 145749668

Exempt-From-Owner-Approval: revert

Change-Id: Ie1d93a200222e26461c1bcd384fdb69b7351e259