Add test for 16kb app compat

- set manifest option for override
- Load 4KB ELF inside app

Flag: android.content.pm.app_compat_option_16kb
Test: atest -c FileSystemUtilsTests
Test: Install 4KB aligned app and see the dialog on 16 KB device
Bug: 371049373
Change-Id: Iccf63811c747da99dad8842676b130913df2e7dd