Updating ose-gcp-pd-csi-driver images to be consistent with ART

Reconciling with https://github.com/openshift/ocp-build-data/tree/faddb23c310d941d9e9c30c97c6d205f694474cc/images/ose-gcp-pd-csi-driver.yml

Dockerfile.openshift

@@ -1,10 +1,10 @@
-FROM registry.svc.ci.openshift.org/ocp/builder:rhel-8-golang-1.15-openshift-4.7 AS builder
+FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.15-openshift-4.7 AS builder
 WORKDIR /go/src/github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver
 COPY . .
 # Skip Windows driver build
 RUN make gce-pd-driver
 
-FROM registry.svc.ci.openshift.org/ocp/4.7:base
+FROM registry.ci.openshift.org/ocp/4.7:base
 # Get mkfs & blkid
 RUN yum update -y && \
     yum install --setopt=tsflags=nodocs -y e2fsprogs xfsprogs util-linux systemd-udev && \