Backport of #9543: Remove the checksum workaround for Flannel VXLAN

[hakman]

Cherry pick of #9548 on release-1.17.

#9548: Revert "Disable TX checksum offload for Flannel VXLAN"

For details on the cherry pick process, see the cherry pick requests page.

[hakman]

/assign @KashifSaadat

[hakman]

/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

@hakman: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-kops-verify-generated	52472ad	link	/test pull-kops-verify-generated
pull-kops-verify-hashes	52472ad	link	/test pull-kops-verify-hashes

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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[hakman]

The failed tests will be removed in kubernetes/test-infra#18254.

[hakman]

/retest

[hakman]

The failed tests should not exist for this branch. Probably a new PR will be required to not trigger them.