[BUG] cachedir mountOption conflict with the custom volume

[zxh326]

What happened:

configmap

volumeMounts :
  - name: jfs-cache
    mountPath: /data/cache
volumes :
  - name: jfs-cache
    persistentVolumeClaim:
      claimName: jfs-cache-pvc

and with cachedir=/data/cache option to create mountpod

will cause mountpod creation failure

error

mountPath: Invalid Value: "/data/cache":  must be unique

The reason is we will create a hostpath volume for each cachedir option.

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?

Environment:

• JuiceFS CSI Driver version (which image tag did your CSI Driver use):
• Kubernetes version (e.g. kubectl version):
• Object storage (cloud provider and region):
• Metadata engine info (version, cloud provider managed or self maintained):
• Network connectivity (JuiceFS to metadata engine, JuiceFS to object storage):
• Others: