Implement VintfObject::getLatestMinLtsAtFcmVersion.

This function returns the MAX of minlts of FCM at
a given level.

Details can be found in the kernel/configs project.
For example, for Android 12, this returns 5.10.43,
and for Android 13, this returns 5.15.41.

Test: TH
Bug: 255995840

Change-Id: Ib83b8013f4b903da6c943f45c572a15d7b2be997
6 files changed