virtiofs: remove useless function

Fix the following clang warning:

fs/fuse/virtio_fs.c:130:35: warning: unused function 'vq_to_fpq'
[-Wunused-function].

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>