ADB controller: Update autonomous database provisioning sample yaml using ECPU

[vmendo]

The current example for ADB serverless provisioning is not working in my OCI tenancy because it is using OCPUs by default.
Sample should use the ECPU model available in any tenancy:

...
dbWorkload: OLTP
computeModel: ECPU
computeCount: 4
licenseModel: BRING_YOUR_OWN_LICENSE
...

[SyNuOra]

Agree with this feedback as OCI shifts from OCPU to ECPU for ADB deployments, this raises issues that could be avoided

[ting-lan-wang]

Hi @vmendo @SyNuOra thanks for the feedback. We will update the samples accordingly soon.