[Charts/Portal] changes to support portal version 5.2

[ksaladi]

Description of the change

The changes will enable customers to install or upgrade the portal version to version 5.2

Benefits

Please see https://techdocs.broadcom.com/us/en/ca-enterprise-software/layer7-api-management/api-developer-portal/5-2/release-notes-api-developer-portal.html

Drawbacks

None

Applicable issues

• fixes #

Additional information

Checklist

• [x] Chart version bumped in Chart.yaml according to semver.
• [x] Variables are documented in the README.md
• [x] Title of the PR starts with chart name (e.g. [charts/gateway])
• [x] If the chart contains a values-production.yaml apart from values.yaml, ensure that you implement the changes in both files