Set runtime flag to zygote

Set runtime flag to zygote to enable page size compat
mode for application which will be started. Based on the runtime
flag, compat mode will be set for application.

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,
Test that app is working in compat mode
Bug: 371049373

Change-Id: Id7ce7088f2b650a6ff6504085bf0dd67049c45a2