Description of problem:
Regular user(not kubeadmin) have no write access right to mounted pv when using kata container runtime.

Version-Release number of selected component (if applicable):
4.8.0-0.nightly-2021-06-16-020345

How reproducible:
Always

Steps to Reproduce:
1. Install the kata-operator and make it as container engine
2. Login into cluster as regular user
$ oc whoami
testuser-10

3. Create pod and pvc, could not write data to mounted volume
sh-4.4$ ls -ldZ /mnt/local/
drwxrwsr-x 3 root 1000670000 ? 4096 Jun 17 11:29 /mnt/local/

sh-4.4$ touch /mnt/local/a
touch: cannot touch '/mnt/local/a': Permission denied

sh-4.4$ id
uid=1000670000(1000670000) gid=0(root) groups=0(root),1000670000

sh-4.4$ mount | grep mnt
kataShared on /mnt/local type virtiofs (rw,relatime)

4. Check on the node:
sh-4.4# mount | grep pvc-bbb65e4c-07e0-4b2c-872b-f21843288038
/dev/sdc on /var/lib/kubelet/plugins/kubernetes.io/gce-pd/mounts/wduan-0617g-gcp-rxnl9--pvc-bbb65e4c-07e0-4b2c-872b-f21843288038 type ext4 (rw,relatime,seclabel)
/dev/sdc on /var/lib/kubelet/pods/705292c8-6915-4612-aca4-83b7ba7e6ad0/volumes/kubernetes.io~gce-pd/pvc-bbb65e4c-07e0-4b2c-872b-f21843288038 type ext4 (rw,relatime,seclabel)

sh-4.4# ls lZd /var/lib/kubelet/plugins/kubernetes.io/gce-pd/mounts/wduan-0617g-gcp-rxnl9-pvc-bbb65e4c-07e0-4b2c-872b-f21843288038
drwxrwsr-x. 3 root 1000670000 system_u:object_r:container_file_t:s0:c10,c26 4096 Jun 17 11:29 /var/lib/kubelet/plugins/kubernetes.io/gce-pd/mounts/wduan-0617g-gcp-rxnl9--pvc-bbb65e4c-07e0-4b2c-872b-f21843288038

Actual results:
Regular user have no write access right to mounted volume.

Expected results:
Regular user should have the write access right to mounted volume.