f2fs: open via dedicated fs bdev helpers

Route the extra device opens of a multi-device f2fs through
fs_bdev_file_open_by_path() so each device is registered against the
superblock, and convert the matching release in destroy_device_list()
to fs_bdev_file_release(). The first device aliases the main bdev file
opened by setup_bdev_super() and is already registered through it.

f2fs opened its extra devices without holder ops, so a freeze, sync, or
removal of one of them was never propagated to the superblock.
Registering them wires those events up: every device now freezes,
thaws, syncs, and shuts down the filesystem like the main device does.

Link: https://patch.msgid.link/20260616-work-super-bdev_holder_global-v2-15-7df6b864028e@kernel.org
Acked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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