Allow specifying --volume-attach-limit in the helm chart

[keznikl]

Is this a bug fix or adding new feature?
Adding support for a new feature

What is this PR about? / Why do we need it?
The new flag was added in https://github.com/kubernetes-sigs/aws-ebs-csi-driver/pull/522/files, this makes it easier to use.

What testing is done?
helm template

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[k8s-ci-robot]

Hi @keznikl. Thanks for your PR.

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[coveralls]

Pull Request Test Coverage Report for Build 1515

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.196%

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Totals
Change from base Build 1510:	0.0%
Covered Lines:	1697
Relevant Lines:	2090

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💛 - Coveralls

[ayberk]

/ok-to-test

Thanks for your contribution! Can you also update the chart version please?

[ayberk]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ayberk, keznikl

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