Changes:
1. Simplified the flow of mnt_id reorder, now it happens only after all sus mounts are umounted in ksu_handle_setuid()
2. All mounts mounted by ksu process will be flagged as sus mount and allocated with a fake mnt_id/mnt_group_id
during ONLY the post-fs-data and service stage, which means other ksu mounts during/after boot-completed stage
will not be handled by susfs.
3. Renaming:
- susfs_mnt_id_ida => susfs_ksu_mnt_id_ida
- susfs_mnt_group_ida => susfs_ksu_mnt_group_ida
- DEFAULT_SUS_MNT_ID => DEFAULT_KSU_MNT_ID
- DEFAULT_SUS_MNT_GROUP_ID => DEFAULT_KSU_MNT_GROUP_ID
4. Increased the default fake mnt_id to 300000, and default fake mnt_group_id to 3000.
5. Unify susfs_is_current_non_root_user_app_proc() and susfs_is_current_proc_su_not_allowed() as susfs_is_current_proc_umounted()
Unify susfs_set_current_non_root_user_app_proc() and susfs_set_current_proc_su_not_allowed() as susfs_set_current_proc_umounted()
Unify TIF_NON_ROOT_USER_APP_PROC and TIF_PROC_SU_NOT_ALLOWED as TIF_PROC_UMOUNTED
6. Removed unused susfs_is_allow_su()
7. Reworked a custom ksu_handle_setuid() which will be used if CONFIG_KSU_SUSFS is defined
Co-authored-by: simonpunk <simonpunk2016@gmail.com>
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