Merge changes from topic 'early-mount-support'

* changes:
  fs_mgr: add a generic fs_mgr_get_boot_config internal API
  init: early_mount: create device node for verity metadata partition
  init: early_mount: disallow partitions to be verified at boot
  init: early_mount: add support to mount verity enabled partitions early
  fs_mgr: make fs_mgr_setup_verity public API
  fs_mgr: fix the fs_mgr_setup_verity param name
  init: refactor to allow successive device_init calls
  fs_mgr: add fs_mgr_do_mount_one() API