Update CP4D CatalogSources to pinned versions

Instead of using the generic IBM CatalogSource, use the version specific CatalogSource to control the version of the Cloud Pak. This will grant users with more control on when a version of a CP will be upgraded otherwise, if the Operator is set to update automatically, the latest release in a `Channel` version will be applied as soon as its released.

@atbijo, let's have a look at this.