Add Intel x550 to supported NICs

[jjuele]

Adding Intel x550 NIC as a supported hardware in the sriov-network-operator.

[github-actions]

Thanks for your PR,
To run vendors CIs use one of:

• /test-all: To run all tests for all vendors.
• /test-e2e-all: To run all E2E tests for all vendors.
• /test-e2e-nvidia-all: To run all E2E tests for NVIDIA vendor.

To skip the vendors CIs use one of:

• /skip-all: To skip all tests for all vendors.
• /skip-e2e-all: To skip all E2E tests for all vendors.
• /skip-e2e-nvidia-all: To skip all E2E tests for NVIDIA vendor.
  Best regards.

[coveralls]

Pull Request Test Coverage Report for Build 4512985956

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.03%) to 25.659%

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Files with Coverage Reduction	New Missed Lines	%
controllers/sriovibnetwork_controller.go	2	66.04%
api/v1/helper.go	3	41.92%

Totals
Change from base Build 4502357889:	0.03%
Covered Lines:	1938
Relevant Lines:	7553

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💛 - Coveralls