fs_mgr_overlayfs: Cleanup -user build stubs
* Categorize functions in fs_mgr_overlayfs.h into three classes:
- Type 1: common and non-critical utilities.
- Type 2: internal routines for facilitating remount.
- Type 3: external entry points for users of fs_mgr_overlayfs, like
fs_mgr_overlayfs_mount_all().
* Move type 1 to common utils header fs_mgr_priv.h & fs_mgr.cpp.
* Move type 2 to new private header fs_mgr_priv_overlayfs.h.
* Keep type 3 in fs_mgr_overlayfs.h.
* Move set-verity-state.cpp under fs_mgr so it can include
fs_mgr_priv_overlayfs.h. File is reformatted as a result. We should
eventually merge and dedup set-verity-state and fs_mgr_remount.
* Add myself to OWNERS for remount-related maintenance work.
Bug: 241179247
Bug: 241688845
Test: Full build -user and -userdebug build.
Test: Presubmit
Test: Treehugger run v2/android-gki/adb_remount
Change-Id: Id5fd0e2b12c693939d712a586dd553cc4d8bfeb1
14 files changed
