OADP-542 [oadp-1.0] Fix restic credential mount for mtc operator

[kaovilai]

MTC operator type requires restic credential volume mount when noDefaultBackupLocation is specified.
/assign
/cherry-pick master
OADP-542

[openshift-ci]

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[kaovilai]

/cherry-pick master

[openshift-cherrypick-robot]

@kaovilai: new pull request created: #726

In response to this:

/cherry-pick master

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[kaovilai]

/cherrypick master

[openshift-cherrypick-robot]

@kaovilai: new pull request could not be created: failed to create pull request against openshift/oadp-operator#master from head openshift-cherrypick-robot:cherry-pick-725-to-master: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"A pull request already exists for openshift-cherrypick-robot:cherry-pick-725-to-master."}],"documentation_url":"https://docs.github.com/rest/reference/pulls#create-a-pull-request"}

In response to this:

/cherrypick master

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