[FIX] core/Fragment: Adding object as possible option for controller
[FIX] core/Fragment: Adding object as possible option for controller

As documented (and implemented), Fragments can take also Objects
instead of Controller implementations. See:
https://sapui5.hana.ondemand.com/#/topic/c24ea6d4d2a34792a7ea241128ad8550

Fixes: https://github.com/SAP/openui5/issues/2267
BCP: 1870457531
Change-Id: I2d814dd7a7de2586105279f1214b4455fc442a81

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