add nodeAffinity rule to inline volume example

[madorn]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

In a 1.17 multi-worker-node environment, with hostpath driver running on a single node properly registered/labeled, I needed to set this nodeAffinity rule to get this example to work. Without it, pod can potentially land on an unregistered node:

MountVolume.SetUp failed for volume "my-csi-volume" : kubernetes.io/csi: mounter.SetUpAt failed to get CSI client: driver name hostpath.csi.k8s.io not found in the list of registered CSI drivers

I believe this is being addressed here: kubernetes/enhancements#1353

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

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[msau42]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: madorn, msau42

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