Ensure NamedCertKeyArray implements flag.Value

[tahsinrahman]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind api-change
/kind bug

/kind cleanup

/kind deprecation
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
var _ flag.Value = &NamedCertKey{} is declared twice. The second check should be for NamedCertKeyArray

kubernetes/staging/src/k8s.io/component-base/cli/flag/namedcertkey_flag.go

Line 31 in e03c775

var _ flag.Value = &NamedCertKey{}

kubernetes/staging/src/k8s.io/component-base/cli/flag/namedcertkey_flag.go

Line 78 in e03c775

var _ flag.Value = &NamedCertKey{}

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Hi @tahsinrahman. Thanks for your PR.

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[tahsinrahman]

/wg component-standard
/cc @mtaufen

[mtaufen]

/ok-to-test
/priority important-soon
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mtaufen, tahsinrahman

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