[INTERNAL] remove private flag from sap.ui.fl to have the inner modules decide if they are public or not
[INTERNAL] remove private flag from sap.ui.fl to have the inner modules decide if they are public or not

To ensure a proper documentation of the spa.ui.fl library also in the public JsDoc, the private flag on the library itself was removed.
This enables the sap.ui.fl.variantManagement.VariantManagement-documentation to be visible

Change-Id: I9edba297c09a37216773c3f5c28d2c3e1e3f10a0

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5