Skip volume expansion if block node

[gnufied]

No expansion on the node should be necessary if device is of type raw block

[coveralls]

Pull Request Test Coverage Report for Build 2023

• 5 of 7 (71.43%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 79.096%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/driver/controller.go	5	7	71.43%

Totals
Change from base Build 2021:	-0.03%
Covered Lines:	1994
Relevant Lines:	2521

---

💛 - Coveralls

[wongma7]

/lgtm
/approve

looks like nodeexpandvolume will no-op anyway, but this is obv. better. thanks

[k8s-ci-robot]

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