Add correct driver selection for Ubuntu Focal Fossa

[wolfgang-desalvador]

What type of PR is this?
Bug Fixes 🐞

What this PR does / why we need it: This PR enables the use of CSI Driver on Ubuntu 20.04 Pools

Which issue(s) this PR fixes:
Fixes the missing mapping of Ubuntu Focal Fossa to the correct repository for AMLFS drivers

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

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• ✅ login: wolfgang-desalvador / name: Wolfgang De Salvador (a1c467c)

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[coveralls]

coverage: 81.844%. first build
when pulling a1c467c on wolfgang-desalvador:main
into 4d91b3b on kubernetes-sigs:development.

[t-mialve]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: t-mialve, wolfgang-desalvador

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