[OCPBUGS-61918] MetalLB: fix BGP backend to frr-k8s

[karampok]

This is the only supported BGP backend

[openshift-ci]

@karampok: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws	39ffa48	link	true	/test e2e-aws

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[fedepaol]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fedepaol, karampok
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[openshift-bot]

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/lifecycle stale

[karampok]

/remove-lifecycle stale