[INTERNAL] sap.m.RatingIndicator: Improve ARIA support
[INTERNAL] sap.m.RatingIndicator: Improve ARIA support

Instead of using aria-label, a hidden label is added, so the
RatingIndicator can support ariaLabelledBy.

Change-Id: I32770959bc0597de7c5a30bdd57c46a2e38b7bde

cschuff/openui5,nzamani/openui5,nzamani/openui5,SAP/openui5,SQCLabs/openui5,SAP/openui5,olirogers/openui5,cschuff/openui5,SQCLabs/openui5,olirogers/openui5,olirogers/openui5,SAP/openui5,SAP/openui5,SQCLabs/openui5,nzamani/openui5,cschuff/openui5