ROSA: improve how OCM token is passed to the controller

[muraee]

/kind feature

Describe the solution you'd like
currently the token is read form an env variable OCM_TOKEN, which requires the user to edit the deployment of the controller.
This workflow could be improved by reading the token from a pre-created secret for example.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Cluster-api-provider-aws version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

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