update image variables

[iamniting]

Describe what this PR does

The new image varables will help exporting and replacing any of the value.

Is there anything that requires special attention

Do you have any questions?

Is the change backward compatible?

Are there concerns around backward compatibility?

Provide any external context for the change, if any.

For example:

• Kubernetes links that explain why the change is required
• Ceph-CSI spec related changes/catch-up that necessitates this patch
• golang related practices that necessitates this change

Related issues

Mention any github issues relevant to this PR. Adding below line
will help to auto close the issue once the PR is merged.

Fixes: #issue_number

Future concerns

List items that are not part of the PR and do not impact it's
functionality, but are work items that can be taken up subsequently.

Checklist:

• Commit Message Formatting: Commit titles and messages follow
  guidelines in the developer
  guide.
• Reviewed the developer guide on Submitting a Pull
  Request
• Pending release
  notes
  updated with breaking and/or notable changes for the next major release.
• Documentation has been updated, if necessary.
• Unit tests have been added, if necessary.
• Integration tests have been added, if necessary.