Set build_logtags true for system partition

This enables etc/event-log-tag file to be installed for the soong
generated system partition.

This change also introduces `partitionSpecificFilesystemProps` to
improve readability.

Test: run diff test and observe etc/event-log-tag is removed from the diff
Bug: 374132914
Change-Id: Id4a084431ccb4644e3ac6c9248c7993d1a75158f