Use same mount to place in the csi.sock, remove obsolete volumes

[frittentheke]

Is this a bug fix or adding new feature?
Bugfix

What is this PR about? / Why do we need it?
Inconsistent use of mounts for csi.sock socket file

What testing is done?
Basic smoke testing on K8S cluster on AWS

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[k8s-ci-robot]

Hi @frittentheke. Thanks for your PR.

I'm waiting for a kubernetes-sigs or kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[coveralls]

Pull Request Test Coverage Report for Build 445

• 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 64.433%

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Totals
Change from base Build 439:	0.0%
Covered Lines:	779
Relevant Lines:	1209

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💛 - Coveralls

[leakingtapan]

/ok-to-test

[leakingtapan]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: frittentheke, leakingtapan

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• OWNERS [leakingtapan]

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[leakingtapan]

/test pull-aws-ebs-csi-driver-integration