Fixes #735 acm - fixed synced false when using private ca

[haarchri]

Signed-off-by: Christopher Haar chhaar30@googlemail.com

Description of your changes

Fixes #735

I have:

• Read and followed Crossplane's contribution process.
• Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

NAME                                                DOMAINNAME                     STATUS   READY   SYNCED   AGE
certificate.acm.aws.crossplane.io/poc-certificate   *.mesh-pca.svc.cluster.local   ISSUED   True    True     3m19s

 kubectl describe certificate.acm.aws.crossplane.io/poc-certificate
Name:         poc-certificate
Namespace:    
Labels:       <none>
Annotations:  crossplane.io/external-name: arn:aws:acm:eu-central-1:255932642927:certificate/19b93893-59e9-4fd5-bf11-6fbfc8d34625
API Version:  acm.aws.crossplane.io/v1alpha1
Kind:         Certificate
Metadata:
  Creation Timestamp:  2021-06-26T20:18:13Z
  Finalizers:
    finalizer.managedresource.crossplane.io
  Generation:        2
  Resource Version:  933146
  Self Link:         /apis/acm.aws.crossplane.io/v1alpha1/certificates/poc-certificate
  UID:               fe16cbff-707b-481f-9cad-85de7e01eab3
Spec:
  Deletion Policy:  Delete
  For Provider:
    Certificate Authority ARN:                    arn:aws:acm-pca:eu-central-1:255932642927:certificate-authority/e6a6ac34-056a-49b3-802c-3b446580d9a4
    Certificate Transparency Logging Preference:  DISABLED
    Domain Name:                                  *.mesh-pca.svc.cluster.local
    Domain Validation Options:
      Domain Name:        *.mesh-pca.svc.cluster.local
      Validation Domain:  *.mesh-pca.svc.cluster.local
    Region:               eu-central-1
    Subject Alternative Names:
      *.mesh-pca.svc.cluster.local
    Tags:
      Key:              Name
      Value:            example
    Validation Method:  EMAIL
  Provider Config Ref:
    Name:  default
Status:
  At Provider:
    Certificate ARN:      arn:aws:acm:eu-central-1:255932642927:certificate/19b93893-59e9-4fd5-bf11-6fbfc8d34625
    Renewal Eligibility:  INELIGIBLE
    Status:               ISSUED
    Type:                 PRIVATE
  Conditions:
    Last Transition Time:  2021-06-26T20:18:14Z
    Reason:                ReconcileSuccess
    Status:                True
    Type:                  Synced
    Last Transition Time:  2021-06-26T20:18:18Z
    Reason:                Available
    Status:                True
    Type:                  Ready

[hasheddan]

LGTM! Nice work @haarchri :)