Fix nvme path filtering logic for udevadm trigger

[pwschuurman]

What type of PR is this?
/kind bug

What this PR does / why we need it:
This PR correctly filters out partition paths in /dev/nvme. The search path was updated in PR#1485, however this introduced logic which filtered out all /dev/nvme paths. The result was that the logic to trigger a udev event for a NVMe device did not work as expected.

Which issue(s) this PR fixes:
Fixes regression of search path https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/pull/1485/files

Special notes for your reviewer:
A follow-up PR will introduce an e2e test for a machine type that uses NVMe (current tests use SCSI), to prevent this type of regression in the future.

Does this PR introduce a user-facing change?:

Fixes a regression in the NVMe device search path

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pwschuurman

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[pwschuurman]

/assign @msau42 @Sneha-at

[mattcary]

/lgtm

[pwschuurman]

/retest

[pwschuurman]

/cherrypick release-1.13

[k8s-infra-cherrypick-robot]

@pwschuurman: new pull request created: #1634

In response to this:

/cherrypick release-1.13

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[pwschuurman]

/cherrypick release-1.12

[k8s-infra-cherrypick-robot]

@pwschuurman: new pull request created: #1647

In response to this:

/cherrypick release-1.12

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[pwschuurman]

/cherrypick release-1.10

[k8s-infra-cherrypick-robot]

@pwschuurman: new pull request created: #1731

In response to this:

/cherrypick release-1.10

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