Revert "Install linux-modules-extra-azure to work around CIFS bug"

[mboersma]

What this PR does / why we need it:

This reverts commit 456428e.

The workaround implemented in #1348 is no longer needed since a newer kernel has proper paths and packaging for the CIFS module.

Which issue(s) this PR fixes:

N/A

Additional context

See https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/2042092 for details.

[jsturtevant]

/lgtm
/retest

Failure was #1355

[jsturtevant]

/retest

[mboersma]

/assign @AverageMarcus

[mboersma]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mboersma

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[mboersma]

/retest

[k8s-ci-robot]

@mboersma: 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
pull-azure-vhds	cc3daa0	link	true	/test pull-azure-vhds

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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