fix bottlerocket compatibility

[mweberjc]

bottlerocket nodes have a r/o file system:

[pod/efs-csi-node-cxcfc/csi-driver-registrar] E0111 23:11:21.812117       1 main.go:107] "Failed to create registration probe file" err="mkdir /var/lib/kubelet/plugins/efs.csi.aws.com: read-only file system" registrationProbePath="/var/lib/kubelet/plugins/efs.csi.aws.com/registration"

with this change:

[pod/efs-csi-node-kg9dt/csi-driver-registrar] I0111 23:14:01.377424       1 main.go:109] "Kubelet registration probe created" path="/var/lib/kubelet/plugins/efs.csi.aws.com/registration"

Is this a bug fix or adding new feature?

bug fix

What is this PR about? / Why do we need it?

bug fix for bottlerocket node compatibility

What testing is done?

verified deployment on bottlerocket

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: mweberjc / name: Michael Weber (d533364)

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This pull-request has been approved by: mweberjc
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