add price info for n4

[yuanwang04]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add price information about GCE N4 machine type.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: yuanwang04 / name: Yuan Wang (8bff3e4, 1e60778, a6eb682)

[k8s-ci-robot]

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[mwielgus]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mwielgus, yuanwang04

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• cluster-autoscaler/cloudprovider/gce/OWNERS [mwielgus]

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