prow.sh: switch back to upstream csi-driver-host-path
prow.sh: switch back to upstream csi-driver-host-path

The temporary fork was merged, we can use the upstream repo again.

kubernetes-csi/csi-driver-nfs,kubernetes-csi/csi-driver-nfs,kubernetes-csi/csi-driver-nfs,kubernetes-csi/external-attacher-csi,kubernetes-csi/csi-lib-utils,kubernetes-csi/csi-lib-utils,kubernetes-csi/csi-lib-utils