added missing crn to vpc resources

[ujjwal-ibm]

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

[astha-jain]

Covered in this PR
data_source_ibm_is_floating_ip
data_source_ibm_is_instance_group
data_source_ibm_is_lb
data_source_ibm_is_security_group_target
data_source_ibm_is_security_group_targets
data_source_ibm_is_virtual_endpoint_gateway
data_source_ibm_is_virtual_endpoint_gateways
resource_ibm_is_instance_group
resource_ibm_is_instance_template
resource_ibm_is_lb
resource_ibm_is_security_group_target
resource_ibm_is_virtual_endpoint_gateway