When CSI's AttachRequired changes from true to false after a successful
volume attach, MarkVolumeAsAttached fails because it attempts to look up
the plugin by spec, which fails verification.
This patch passes the VolumeName directly to MarkVolumeAsAttached.
This allows the function to skip the plugin lookup and correctly mark
the volume as attached in the Actual State of World, ensuring
VolumeAttachment cleanup can proceed.
Signed-off-by: hongkang <mzhkcj50@gmail.com>