chore: Update documentation for installing EFA device plugin to use official EKS chart

[bryantbiggs]

Description:

• Update documentation for installing EFA device plugin to use official EKS chart

We would like to remove the sample manifests provided in aws-samples/aws-efa-eks#22 (comment) and instead refer users to the official device plugin Helm chart.

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[bryantbiggs]

@aws-maens / @rgrandhiamzn any updates? we'd like to encourage users to use the official chart and not the dated manifests from a sample repo, thank you!

[bryantbiggs]

FYI - the EKS docs have now been updated to reflect this change:

[bryantbiggs]

@jeffhataws any update on merging this so we can remove the dependency on the samples repo?

[geetasg]

lgtm. cc @mounchin @arjraman - we should update this to use our helm chart as well.