ext4: use anonymous devices for KUnit test superblocks

The mballoc and extents KUnit tests create superblocks through
sget_fc() with a set callback that never assigns s_dev and a kill_sb
that only calls generic_shutdown_super().

The upcoming global device-to-superblock table registers every
superblock under its s_dev, so each superblock needs a unique device
number. Allocate a proper anonymous device via set_anon_super_fc() and
release it through kill_anon_super().

Link: https://patch.msgid.link/20260616-work-super-bdev_holder_global-v2-5-7df6b864028e@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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