Remove TODO in ../ovn/gateway_dataplane.go since an issue is raised #3097 #4914

Job	Run time
Submariner K8s API Code Generation	1m 23s
No "Apply suggestions from code review" Commits	7s
Commit Message(s)	11s
Go	3m 19s
Dependency Licenses	2m 0s
Markdown Links (modified files)	13s
Markdown	8s
Package Documentation	52s
Protobuf Code Generation	38s
Shell	7s
Variant Analysis	3m 19s
Vulnerability Scanning	27s
YAML	8s
	12m 52s

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