qemu-virtio-9p: Implement TREADLINK operation for 9p2000.L

qemu-virtio-9p: Implement TREADLINK operation for 9p2000.L

Synopsis

        size[4] TReadlink tag[2] fid[4]
        size[4] RReadlink tag[2] target[s]

Description
        Readlink is used to return the contents of the symoblic link
        referred by fid. Contents of symboic link is returned as a
        response.

        target[s] - Contents of the symbolic link referred by fid.

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>